The answer is you will need 300 ml of 65% solution and 150 ml of 20% solution to produce 450 ml of a 50 per cent solution.
According to the question:
Start by defining variables to represent the amounts of each of the solutions that are going to be mixed.
So let x = the amount of the 65% solution, and y = the amount of the 20% solution.
First of all, you know that x + y = 450, because after they are mixed you want to have 450 ml of the 50% solution.
Second, look at how much acid is in each of the starting solutions and how much is in the ending solution.
The 65% solution is 65% acid, so the amount of acid in it is 65% of x, or .65x. Similarly, the amount of acid in the 20%
solution is 0.2y
At the end, the amount of acid you want to end up with is 50% of 450ml, so that's 225 ml.
When you mix the two solutions, you're not going to change the total amount of acid you started with. This means that
0.65x + 0.2y = 225
So, you have two solutions with two unknowns, and that's something you can solve:
x + y = 450
0.65x + 0.2y = 225
Let's use elimination. Multiply the first equation through by 0.65:
0.65x + 0.65y = 0.65*450 = 292.5
Now you have:
0.65x + 0.65y = 292.5
0.65x + 0.2y = 225
Subtract:
0.45y = 67.5
Divide by 0.45
y = 67.5 / 0.45 = 150
Since x + y = 450, that means that x = 300.
So, you will need 300 ml of 65% solution and 150 ml of 20% solution to produce 450 ml of a 50 per cent solution.
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Which kind of thermal energy transfer warms your hand when you hold a hot
mug of tea?
A. Radiation
B. Convection
C. Conduction
D.Translation
[tex]\huge \boxed{\sf C}[/tex]
Conduction: Heat transfers into hands when holding a hot cup of coffee. Heat energy is transferred between or inside substances by conduction. We can use any media for conduction, but physical media is required.
The kind of thermal energy transfer that warms your hand when you hold a hot mug of tea is called conduction. The correct option is C.
What is conduction?Direct contact between molecules inside a substance allows for the transfer of energy, typically in the form of heat and/or electricity. Conduction can occur in gases, liquids, and solids.
Conduction heat transfer primarily takes place in stationary mediums, including solids or fluids that are at rest.
When holding a hot cup of coffee, heat is transferred to the hands. Conduction is the method of transferring heat energy inside or between materials. Any medium can be used for conduction, although physical mediums are necessary.
Therefore, the correct option is C. Conduction is correct for the process mentioned above.
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What is the formula to add values from cell A2 to cell A20?.
In Excel, the syntax =SUM(A2:A20) is used to add the values in cells A2 and A20.
A straightforward formula can be used to add the values in a range (a collection of cells), however, the SUM function is more user-friendly when dealing with larger numbers. In contrast to =A2+A3+A4+A5+A6, =SUM(A2:A6) is less likely to have typographical errors.
To formulate the equation:
In a cell, enter =SUM and then the opening parenthesis ().
Type A2:A4 to enter the first formula range, also known as an argument (a piece of information required for the formula to function).
To distinguish the first argument from the second, type a comma (,).
C2:C3 is the second argument to type.
Enter after typing a closing parenthesis.
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What is the net ionic equation for the reaction that occurs when you mix aqueous solutions of nahco3 and hc2h3o2 ?.
The net ionic equation for the reaction that happens when you combine nahco3 with hc2h3o2 aqueous solutions.
HCO3-(aq) + [tex]H^{+}[/tex] (aq) → H2o(l) + Co2(g)
Below is the balanced chemical equation for the reaction between sodium bicarbonate and acetic acid.
NaHCO3 + CH2COOH → CH3COONa + H2O + CO2
The net ionic equation is:
HCO3- + [tex]H^{+}[/tex] → H2O + CO2
In the form of symbols and chemical formulas, a chemical equation is a symbolic representation of a chemical reaction. On the left side are the entities that make up the reactants, and on the right side are the entities that make up the products. There is a plus sign between the entities that make up the reactants and the products, and the arrow pointing in the direction of the products indicates the direction of the reaction. [1] The chemical equations could be mixed, structural (represented by a picture diagram), or both. The stoichiometric numbers' absolute values are shown as coefficients next to the symbols and formulas of the various entities. In 1615, Jean Beguin drew the first chemical equation.
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Predict the major organic product of the reaction shown. Include any lone pairs of electrons and nonzero formal charges. Draw only one compound. Your product should include a ring structure. H2N excess CH38r 1st attempt hl See Periodic Table See Hint Select a tool to begin drawing CI Marvin iS
Amines are organic substances that have a lone pair of nitrogen atoms in them.
Explain about the Amines?Alkylamines and arylamines respectively, are essentially derivatives of ammonia (NH3) in which one or more hydrogen atoms have been swapped out for a group from the alkyl or aryl family.
An important class of chemical compounds known as amines is created by substituting one or more hydrogen atoms in the ammonia molecule with an alkyl/aryl group (s). They coexist in nature with proteins, vitamins, alkaloids, and hormones. Polymers, dyes, and pharmaceuticals are examples of synthetic materials.
A nitrogen atom that is creating a total of three bonds makes up the functional group known as the amine: One connection to the organic chain's parent. Two distinct bonds, either involving an alkyl group R or a hydrogen atom
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Sulfate in soil on Mars. In 2008, Professor Sam Kounaves and his students at Tufts University had the thrill of their lifetime as their Wet Chemistry Laboratory aboard the Phoenix Mars Lander returned a steam of information about the ionic composition of Martian soil scooped up by a robotic arm. The arm delivered ~1 g of soil through a sieve into a "beaker" fitted with a suite of electrochemical sensors. Aqueous solution added to the beaker shown in the figure leached soluble salts from the soil while sensors measured ions appearing in the liquid. Unlike other ions, sulfate was measured by a precipitation titration with Ba²+: BaCl2(8) Ba2+ (aq) + 2 C1-(aq) so - (aq) + Ba2+(aq) → BaSO4(s) As solid BaCl, from a reagent canister slowly dissolved in the aqueous liquid, BaSO4 precipitated. A barium sulfate precipitation titration is shown in the figure. The initial concentration of Cl- before adding BaCl, was 0.00019 M in 25 mL of aqueous extract of Martian soil. At the end point, when there is a sudden rise in Ba2+, [C1-] = 0.0096 M. -2.0 log (concentration, M) - 1.0 Leaching solution added Cl- calibration solution added CI- Soil added and BaCl2 begins to enter cell Cl- = 0.009 6 M -3.0 at end point -Cl = 0.000 19 M before BaCl2 addition 4.0 Ba2+ End point -5.000 0:00 2:00 4:00 6:00 8:00 10:00 12:00 14:00 16:00 Time (h) Write the titration reaction. titration reaction: How many mmol of BaCl, were required to reach the end point? millimoles of BaCl2: mmol How many mmol of So were contained in the 25 mL? millimoles of S02 : mmol If so2 is derived from 0.920 g of soil, what is the wt% of so in the soil?
The statement claims that 5mmol of BaCl were needed to attain the goal.
What distinguishes aqueous from liquid?In a chemical equation, the word "aqueous" refers to a substance that is disseminated in saltwater (a solution in water). For instance, sodium chloride is produced when sodium hydroxide solution is added to diluted hydrochloric acid. The word "liquid" denotes the creation of liquid substances during a process.
An aqueous solution is what?In an aqueous solution, liquid water acts as the solvent. Solute (disintegrated) protons and atoms are surrounded by and incorporated into the web of bonds by water molecules. The dissolved organisms then spread out across the water.
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What are the substances that dissolve rapidly in water called?.
The substances that dissolves rapidly in water are called Soluble substances.
A soluble substance is one that dissolves in a liquid, usually water. It might look like it's simply disappeared, but in fact, it's just mixed in to form a liquid called a solution . The solid that dissolves is called the solute . The liquid that dissolves the solute is called the solvent. Sugar, salt, mustard oil, sand, sawdust, honey, chalk powder, petals of flowers, soil, crystals, glucose . In the simple way solubility is the ability of a substance, the solute, to form a solution with another substance, the solvent. Everything is made of particles which are always moving. When a soluble solid is mixed with the right liquid it forms a solution. This process is called dissolving.
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if none of the bread molded what do you think the reason
Answer:
It old and rotted and the date had expired
In a common reaction in living things, glucose combines with oxygen to form carbon dioxide and water vapor. In an experiment on this reaction, the masses of all four substances are measured. This data table shows the measurements.
Which change to the reaction would allow more than 198 grams of carbon dioxide to be produced?
The change to the reaction that would allow more than 198 grams of carbon dioxide to be produced is to increase the mass of glucose to 135 g.
What are the moles of carbon dioxide present in 198 grams of carbon dioxide?The moles of carbon dioxide present in 198 grams of carbon dioxide is calculated as follows:
Moles of carbon dioxide = mass / molar mass
molar mass of carnbon dioxide = 44.0 g/mol
Moles of carbon dioxide = 198 / 44
Moles of carbon dioxide = 4.5 moles
The equation of the breakdown of glucose is:
C₆H₁₂O₆ + 6 O₂ (g) ---> 6 CO₂ (g) + 6 H₂O (g)
Assuming that oxygen is in excess, moles of glucose require to produce 4.5 moles of carbon dioxide = 4.5 * 1/6 moles
Moles of glucose required = 0.75 moles
Hence, mass of glucose required = 180 g/mol * 0.75
mass of glucose required = 135 g
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Complete question:
In a common reaction in living things, glucose combines with oxygen to form carbon dioxide and water vapor. In an experiment on this reaction, the masses of all four substances are measured. This data table shows the measurements.
Mass of glucose = 120 g
Mass of Oxygen = 130 g
Mass of Carbon dioxide = 175 g
Mass of Water = 70 g
Which change to the reaction would allow more than 198 grams of carbon dioxide to be produced?
you know the number of coulombs passed and the number of moles of h2 collected. how many electrons per h2 molecule?
The number of electrons in one mole of H2 molecule was found to be. 6.023x10^23
what are electrons ?
The electron is a subatomic particle with an initial electric charge of -1. Electrons are the first generation of the lepton particle family and are often regarded as elementary particles due to the lack of known components or substructure. The mass of an electron is roughly 1/1836 that of a proton. The electron's quantum mechanical characteristics include a half-integer intrinsic angular momentum (spin) given in units of the decreased Planck constant, Because electrons are fermions, they cannot inhabit the same quantum state, according to the Pauli exclusion principle. Electrons, like other elementary particles, have both particle and wave properties: they may collide with other particles and be diffracted like light.
Because electrons have a smaller mass and hence a longer de Broglie wavelength for a given energy, their wave characteristics are simpler to examine with experiments than those of other particles such as neutrons and protons.
The number of electrons in one mole of H2 molecule was found to be. 6.023x10^23.
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Is albumin an amino acid or protein?.
Albumin is the major protein in the serum of mammals.
The liver produces a protein called albumin. The quantity of this protein in the transparent liquid component of the blood is determined by a serum albumin test.
A tiny globular protein called human albumin has a molecular weight of 66.5 kilodaltons (kDa). There are 585 amino acids in total, which are arranged into three repeated homologous domains and two distinct subdomains, A and B.
The family of globular proteins, of which serum albumins are the most common member, includes albumin. The albumin protein family is mildly soluble in high salt solutions and is heat denaturable. Milk contains -lactalbumin, while serum albumin is found in blood serum.
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how is the periodic table organized in regards to blocks? what are these specific blocks? how do they relate to electron location and orbitals?
The periodic table is organized according to the blocks s-block, p-block, d-block, and f-block; these particular blocks are related to electron position and orbitals.
A group of elements in the periodic table known as a block are connected by the atomic orbitals in which their valence electron or vacancies are located. It appears that Charles Janet coined the phrase originally. S-block, P-block, D-block, and F-block are the names of the four blocks, each of which is named after a certain orbital.
The known elements are arranged in the periodic table chart in order of increasing atomic electron and recurrent chemical characteristics. They are arranged in a tabular format, where a row denotes a time period and a column a group.
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TRUE/FALSE. according to our article, in humans, it looks like the habitual consumption of food, specifically calorie dense food, can elicit changes in brain responses that mirror drug addiction.
TRUE, in humans, it looks like the habitual consumption of food, specifically calorie-dense food, can elicit changes in brain responses that mirror drug addiction.
The term "food addiction" describes compulsive eaters who frequently have uncontrollable eating episodes (binge eating). Binge eating is the practice of consuming an unhealthy amount of food while feeling out of control.
The brain's pleasure centers are activated and "feel-good" neurotransmitters like dopamine and serotonin are released when "highly appealing" foods, or those heavy in carbohydrates, fat, salt, sugar, or artificial sweeteners, are consumed.
Despite not being included in the Diagnostic and Statistical Manual of Mental Disorders (DSM-5), food addiction can resemble other addictions and frequently needs the same therapies and support to be overcome. Thankfully, several initiatives and therapies can offer care.
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During this reaction, water is evaporating from the solution at the same time some of the CO2 is dissolving into the water. How might these factors affect the results of the experiment? Explain each effect and the overall effect.
Alka-Seltzer in Water Reaction
Water and carbon dioxide chemical reaction in the following way: CO 2 (g) carbon dioxide + H 2 O (l) water = H 2 CO 3 (aq) carbonic acid.
What happens when CO2 reacts with water?When carbon dioxide and water combine, carbonic acid is created. From this acid, hydrogen ions separate, raising the system's acidity. Therefore, anthropogenic carbon dioxide emissions to the atmosphere have the potential to enhance precipitation in addition to any warming impact.The chemical change that takes place when carbon dioxide and water interact is the formation of carbonic acid. However, Henry's rule, which states that when a gas is converted into a liquid, pressure changes as well, denotes a physical change when these two molecules join.Water and carbon dioxide are the byproducts of hydrocarbon burning.Decarbonation, often known as "Degasification," is the most practical approach to remove free carbon dioxide from water. By using the decarbonation process, CO2 levels may be reduced by 99% or more.Learn more about CO2 reacts with water refer to :
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What happens to h the height of the mercury column, if the atmospheric pressure increases?.
The height of mercury column increases. Length of the column is directly proportional to the pressure exerted on the column.
What is atmospheric pressure?
The force that gas particles in the Earth's atmosphere apply to objects when they hit with them is known as atmospheric pressure. The atmospheric pressure is measured with a barometer. As height rises, atmospheric pressure falls.
What is mercury?
A naturally occurring chemical element called mercury is present in coal deposits as well as rock found in the earth's crust. It has the atomic number 80 and the symbol "Hg" on the periodic table. It comes in a variety of shapes: Metallic element mercury.
Therefore, the height of mercury column increases. Length of the column is directly proportional to the pressure exerted on the column.
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What process was primarily responsible for the development of the present percentage of free oxygen in the Earth's atmosphere?.
The process is known as photosynthesis, and it involved creating gaseous, or free, oxygen from carbon dioxide, water, and sunshine.
Air or a gas: which is oxygen?Oxygen is a transparent, tasteless, & cloud of gas that is essential for all life forms. It is ingested by animals, who then convert it to carbon dioxide, which is then used by plants to create new carbon and release oxygen back into the atmosphere.
Is oxygen pure enough for you to breathe?Normal air only has a 21% oxygen content. As a result of the high oxygen content, all of the body's organs may benefit from having enough oxygen. Long-term inhalation of 100% oxygen can, unfortunately, alter the lungs in ways that could be dangerous.
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How is concentration related to mole fraction?.
Concentration is related to mole fraction as - A unit of concentration is a mole fraction.
The mole fraction, which is denoted by "X," is a unit of measurement for the ratio of solute to solvent in a solution. The number of moles of a particular component in the solution divided by the overall number of moles in the sample solution is known as the mole fraction. It can be said in a variety of ways: molarity, or the number of solute molecules per litre of solution; mole fraction, or the proportion of solute molecules to all other molecules present.
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12.3 show that the minimum cation-anion radius ratio for a coordination number of 6 is 0.414. [hint: use the nacl crystal structure (figure 12.2), and assume that anions and cations are just touching along cube edges and across face diagonals.]
If we use the NaCl crystal structure for the minimum cation to anion radius ratio for a co-ordination number of 6, then its ratio is 0.414.
In the given problem, we need to find out the cation-anion ratio of a co-ordination number 6. In the attached image, we can see the one of the face of rock-salt structure in which cation and anion just touch along the edges, and face the diagonals.
In the face of rock salt, we can see that triangle FGH is formed and the GF is equal to 2ra because it is divided in two atoms. Hence GF=2a and
FH=GH=ra+rc
Since FGH is a right angle triangle and according to pythagoras theorem
(ra+rc)²+(ra+rc)²=(2ra)²
2(ra+rc)²=4ra²
(ra+rc)²=4ra²/2
Take square root on both side
ra+rc=2ra/√2
Divide both side by ra
(ra+rc)/ra=2/√2
1+(rc/ra)=2/√2
rc/ra=(2/√2)-1
rc/ra=(2/1.414)-1
rc/ra=1.414-1
rc/ra=0.414
Therefore, the minimum cation-anion radius ratio for a coordination number of 6 is 0.414.
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the stability of the intermediate alkyl cation and the polarity of the solvent will play a big role in the rate of sn1 reaction, while the steric hinderance around the reacting center will be of prime importance in the sn2 reaction. which of the following alkyl halides will be predicted to react faster in the sn1 reaction? select one: 2 - chloro - 2 - methylpropane 1 - chlorobutane 2 - chlorobutane
The compound that would react faster by the SN1 mechanism is 2 - chloro - 2 - methylpropane.
What is the faster SN1 reaction?We know that a nucleophilic reaction would involve the the attack of a negatively charged specie or a specie that has a lone pair of electrons on a positive center.
We know that the SN1 reaction is the nucleophilic substitution that occurs by a unimolecular mechanism and would lead to the formation of a stable carbocation. This is most common with the tertiary alky halides as we know and 2 - chloro - 2 - methylpropane is a tertiary alky halide.
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An alpha cannot penetrate your skin. Once inside the body, however, an alpha source is the most hazardous radiation since it causes the most ionizing events per unit length. There is really only one way a sealed alpha source can hurt you. What is it?.
There is really only one way a sealed alpha source can hurt you. It is B. By ingestion.
Alpha is the first letter of the Greek alphabet. within the gadget of Greek numerals, it has a price of 1. Alpha is derived from the Phoenician letter aleph, that's the West Semitic word for "ox". Letters that arose from alpha include the Latin letter A and the Cyrillic letter А.
Alpha refers to a dominant person or their conduct, in particular with admire for socially competitive, hyper-masculine men.The word "Alpha" comes from the primary letter of the Greek alphabet and symbolizes the beginning or the start line of a journey.
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In identifying an unknown cation that was exposed to a flame that turned green, the conclusion that the cation was
a- HCl
b- Sulfur
c- Nal
d- copper
Copper cation exposed to a flame that turned green.
The chemical element copper (Cu) is a reddish, very ductile metal belonging to Periodic Group 11 (Ib) that has an exceptional ability to conduct heat and electricity. In nature, copper may be found in its free metallic state. Neolithic (New Stone Age) people originally utilised this local copper (about 8000 BCE) as a replacement for stone. Around 4000 BCE, Mesopotamia saw the beginning of metallurgy when copper was cast into molds, reduced to metal from ores with fire and charcoal, and purposefully alloyed with tin to become bronze (c. 3500 BCE). Nearly all of the copper the Romans used came from Cyprus. Its name, aes Cyprium, or "metal of Cyprus," was eventually abbreviated to cyprium and then changed to cuprum.
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Calculate the mole fraction of ki in a solution made by dissolving 3. 4 g of ki in 5. 8 g of water.
The mole fraction of ki in a solution made by dissolving 3. 4 g of ki in 5. 8 g of water: 0.060.
Mole fraction = Moles of componentMoles of all species in solution. And thus, Mole fraction, KI = Moles of KIMoles of KI + moles of water.
The mole fraction may be calculated by using dividing the wide variety of moles of one issue of an answer by means of the overall variety of moles of all the additives of an answer. it is mentioned that the sum of the mole fraction of all the additives inside the answer needs to be identical to at least one. Mole percentage ( ) is the same as a mole fraction in chemistry, however in a special guise. Multiplying the mole fraction through one hundred yields the mole percent of the given component. Mole Fraction = the variety of moles of 1 aspect in the given combination and the overall quantity of moles in the combination.
A mole fraction is a unit of attention, defined to be the same as the number of moles of an issue divided by means of the whole number of moles of a solution. because it's far a ratio, the mole fraction is a unitless expression.
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Cesium (Cs) tends to be the most reactive of the alkali metals (francium is radioactive and has not been well studied). Based on your understanding of atomic radius, effective nuclear charge, and ionization energy, explain why this is true. 15. Time to Reflect…Consider everything you’ve learned in lab and lecture about periodic trends. In your own words, explain why it is important to know how the periodic table is organized. How do you think knowledge on periodic trends (ionization energy, electron affinity, atomic radius, electronegativity, etc.) help you, personally, in your future as scientist and/or engineer? 10. Explain how the reactivity with acid relates to the location of the metals on the periodic table.
Caesium(Cs) is the most reactive alkali metal in the group I than the francium due to the atomic radius, effective nuclear charge and the ionization energy of the caesium element.
Ionization energy is the energy requires to remove valence electron from the outer orbital. As we goes down the group, the ionization energy is decreased. This is occurred because as we goes down the group, the distance between outermost orbital and nucleus is increased. Therefore, it has lower ionization energy than other elements in the group.
Atomic radius of the element is the distance between the nucleus and the electron present in the outermost orbital. As we goes down the group, atomic radius is decreased. Therefore, it easily donates electrons and due to this, caesium is more reactive.
Fracium is really heavy element and there are many positive charges present in the nucleus of the francium. Due to the presence of more positive charges, electrons in the francium revolve at a speed of light. The electrons in the francium are closer to the nucleus than the caesium and it is harder to remove valence electrons in the caesium.
Therefore, caesium is reactive than the francium due to the ionization energy, atomic radius and effective nuclear charge.
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a half liter of coke has about 58.0g of sugar (straight c subscript 12 straight h subscript 22 straight o subscript 11). what is the molar concentration of the sucrose?
The molar concentration of the sucrose is 13M.
What is molar concentration?
The best way to describe a solution's solute concentration is in terms of molar concentration. The total number of moles of dissolved solute per liter of solution is referred to as molarity.
What is sucrose?
The monosaccharide sugars glucose and fructose are joined to form sucrose, a disaccharide, or two-part molecule. Invertases are digestive enzymes that help honeybees break down plant nectars into honey, which is primarily a mixture of sucrose, glucose, and fructose.
Therefore, the molar concentration of the sucrose is 13M.
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The molar concentration of the sucrose is 13M.
What is molar concentration?
The quantity of moles of a solute per liter of solution is called the molar concentration, sometimes referred to as the molarity.
Molecular weight of sucrose is 342.30 The molar concentration of sucrose is the moles of sucrose divided by the amount of water used to make the solution.
Therefore the molar concentration of the sucrose is 13M.
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write down the common (not iupac) names of the organic molecules that would be released if this molecule were hydrolyzed:
Triacylglycerol or triglycerides. Triacylglycerols molecule were hydrolyzed into free fatty acids and glycerol before being converted into energy.
What lipids undergo hydrolysis?Lipids, whether they are saturated or unsaturated, will hydrolyze with time. The following five hydrolysis byproducts are produced when a single phosphatidylcholine molecule is hydrolyzed: Glycerophosphorylcholine, free fatty acids, 1-Acyl-Lyso-PC, and 2-Acyl-Lyso-PC.
Triglycerides are broken down by what kind of reaction?Lipolysis. Triglycerides must first undergo hydrolysis to separate into their two main parts, fatty acids and glycerol, in order to be converted into energy. The process of lipolysis occurs in the cytoplasm.
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Corrosion of structural metals can occur in a variety of ways. Identify the appropriate type of corrosion for the following situation:
Localized attack between a metal-to-metal joint in which high concentrations of H+ and Cl- ions are found.
Some of the types of corrosion are uniform corrosion, galvanic corrosion, stress corrosion etc.
Corrosion is a natural process that generally converts a refined metal into a more chemically stable oxide. It is the gradual deterioration of materials (usually a metal) by chemical or electrochemical reaction with their environment. Corrosion engineering is the field dedicated where in they focus on controlling and preventing corrosion.
Common types of corrosion that are seen within industrial, marine or also offshore and oil and gas include 5 main categories. These are what we will cover in this blog post, including suggestions on how to prevent it.
Metals that are attacked by corrosive substances are open to damage that can effect the durability and safety of the alloy. This is a huge concern for sectors of industry with environmental considerations. For example, within the marine and offshore industries, engineers will require metals that can withstand.
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Do like radicals have the same radicand?.
Yes, similar radicals are those with the same index and radicand. When the index and the radicand of two or more radicals are the same, combining radicals is conceivable.
Finding a number that, when multiplied by itself, equals the value indicated by the radical symbol is instructed. Radicand is the name for the number displayed beneath the radical sign.
We must first transform two or more radicals into radicals of different orders in order to compare them. The radicands must then be compared. The radicals of various orders can be changed into radicals of the same order by using the least common multiple of the various orders provided.
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how many minutes would a 12.5 ampere current have to be applied to plate out 12.5 grams of copper metal from aqueous copper(ii) sulfate solution?
The minutes would a 12.5 ampere current have to be applied to plate out 12.5 grams of copper metal from aqueous copper(ii) sulfate solution are 50.65 min.
Deposition of cu is :
change in coloumb = Ax T = 12.5 A Total no. of moles = 12.5 x t x c x moles of electrons / 96500012.5 / 96500Cu formed = 12.5 / 63.5 molt = 12.5 x 2 x 96500/63.5 x 12.5 = 3089.375 sec = 50.65 min.The time is calculated by the calculation of total no. of moles calculted of copper an thus the time came out to be 3089 secs and 50.65 in minutes.
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for a copper-silver of composition 50 wt% ag-50% cu and at 777 c do the following: i)determine the mass fractions of a and b. ii) determine the mass fractions of primary b and eutectic microconstituents. iii) determine the mass fraction of eutectic a.
A) The mass fractions of a and b phases are respectively; [tex]W_{a}[/tex] = 0.49 and [tex]W_{b}[/tex] = 0.50 ,B) [tex]W_{a}[/tex] = 0.34 and W_e = 0.65 ,C) The mass fraction of eutectic αais; [tex]W_{a}[/tex]= 0.07 .
What is the mass fraction?It is the proportion of that component's mass to the mixture's overall mass. This equals the mass fraction, which must be multiplied by 100 to be converted to a percentage.
Briefing :
(a) We are trying to find the mass fractions of a and b phases.
From the Cu - Ag phase diagram, we have;
[tex]C_{a}[/tex] = 8.0 wt% Ag
[tex]C_{b}[/tex] = 91.2 wt% Ag
C₀ = 50 wt% Ag
Using the lever-rule, we have;
Total mass fraction of a is;
[tex]W_{a}[/tex] = ( [tex]C_{b}[/tex]- C₀)/([tex]C_{b}[/tex] - [tex]C_{a}[/tex])
[tex]W_{a}[/tex] = (91.2 - 50)/(91.2 - 8)
[tex]W_{a}[/tex] = 0.49
Total mass fraction of b is;
[tex]W_{b}[/tex] = (C₀ - [tex]C_{a}[/tex])/([tex]C_{b}[/tex] -[tex]C_{a}[/tex] )
[tex]W_{b}[/tex] = (50 - 8)/(91.2 - 8)
[tex]W_{b}[/tex] = 0.50
(b) We want to find the mass fractions of primary a and eutectic microconstituents. We have;
C_eutetic = 71.9 wt.%Ag
Mass fraction of primary a is;
[tex]W_{a}[/tex] = (C_eutetic - C₀) /(C_eutetic - Ca)
[tex]W_{a}[/tex] = (71.9 - 50)/(71.9 - 8)
[tex]W_{a}[/tex] = 0.34
Mass fraction of eutectic micro-constituents is;
W_e = (C₀ -[tex]C_{a}[/tex] )/(C_eutetic - [tex]C_{a}[/tex])
W_e = (50 - 8)/(71.9 - 8)
W_e = 0.65
(c) Determine the mass fraction of eutectic α.
From the eutetic reaction;
Total a = Primary a + a in eutectic mixture
Thus:
mass fraction of eutectic a = Total a - Primary a
mass fraction of eutectic a= 0.8 - 0.73 = 0.07
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calculate the molarity of a solution prepared by dissolving 12.0 g of na2cro4 in enough water to produce a solution with a volume of 680. ml .
Calculate an approximate heat of combustion for ethane (C2H6) in kilojoules per mole by using the bond dissociation energies in the table. (The strength of the O=O bond is 498 kJ/mol, and that of a C=O bond in CO2 is 804 kJ/mol.)
Heat of combustion of ethane is -1559.7 J/mol.
What is heat of combustion?
It is the heat evolved when 1 mole of a substance is burnt in oxygen under standard conditions.
value of ∆H° can be calculated from the change in enthalpy of standard formation:
∆H ° rxn = Σn ∆Hf° of product - Σn AHf of reactants
∆H ° rxn = ∆Hf of the product (s) if ∆Hf (reactants) = 0
elements in standard conditions are not included in enthalpy calculations because the enthalpy of those elements under the standard conditions is zero.
We have the following information;
∆H° f H2O: - 285.8 kJ
∆H°f CO2: - 393.5 kJ
∆H°f C2H6: - 84.7 kJ
The equation of the reaction is;
2 C2H6 + 7 O2 --> 4 CO2 + 6 H2O
So
∆H° reaction = [4(- 393.5) + 6(- 285.8)] - [2(- 84.7) + 7(0)]
∆H° reaction = [(- 1574) + (- 1714.8)] + 169.4
∆H° reaction = - 3119.4J / m * ol
If 2 moles of C2H6 produces -3119.4 J/mol then
1 mole of C2H6 produces -3119.4 /2
= -1559.7 J/mol
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