a. There are 1.85 moles in 2.00 × 10² g of silver (Ag).
b. There are 0.618 moles in 37.1 g of silicon dioxide (SiO₂)
What is the molar mass?The molar mass is the mass in grams of 1 mole of particles, that is, the mass in grams of 6.02 × 10²³ particles. The units are g/mol.
We want to calculate the number of moles represented by different masses of different substances. In each case, the conversion factor between mass and moles is the molar mass.
a. 2.00 × 10² g of silver (Ag)The molar mass of silver is 107.87 g/mol.
2.00 × 10² g × (1 mol/107.87 g) = 1.85 mol
b. 37.1 g of silicon dioxide (SiO₂)The molar mass of silicon dioxide is 60.08 g/mol.
37.1 g × (1 mol/60.08 g) = 0.618 mol
a. There are 1.85 moles in 2.00 × 10² g of silver (Ag).
b. There are 0.618 moles in 37.1 g of silicon dioxide (SiO₂)
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Consider a 100-gram sample of radioactive cobalt-60.
How much time will it take before half the sample has decayed?
It will take 5.2 years to decay.
The half life of cobalt-60 is 5.2 years. The half life is the time taken for the mass of the substance to decrease by a half.
here, the amount of remaining substance is 50%,
so, [tex](\frac{1}{2} )^{n} = 0.5[/tex]
n. log (0.5) = log (0.5)
n = 1
So it would take 1 half lives to decay this much, which is 1 x 5.2 which is 5.2 years.
what do you mean by radioactive decay ?
The process through which an unstable atomic nucleus loses energy via radiation is known as radioactive decay, also known as nuclear decay, radioactivity, radioactive disintegration, or nuclear disintegration. A material that has unstable nuclei is considered as radioactive.
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what is the nature of ions formed by different atoms.
The nature of ions formed by different atoms is as follows:
Metal atoms form positively-charged ionsNon-metal atoms form negatively-charged ionsWhat are ions?
Ions are substances which are formed when neutral atoms gain or lose electrons.
There are two types of ions based on the charge the ion carries;
anions - which are negatively-chargedcations - which are positively-chargedThe nature of the ions formed by different atoms depend on whether the atoms are atoms of metals or atoms of non-metals.
Metal atoms form positively-charged ions by the loss of one or more electrons as illustrated below:
M → M⁺ + e⁻where; M is a metal atom, M⁺ is a metal ion, and e⁻ is an electron.
Non-metal atoms form negatively-charged ions by the gain of one or more electrons as illustrated below:
N + e⁻ → N⁻where; N is a non-metal atom, N⁻ is a non-metal ion, and e⁻ is an electron.
In conclusion, the nature of ions formed by atoms depends on the nature of the atom, whether they are metallic or non-metallic atoms.
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How many moles are in 25.3 grams of SO 3?
A.
3.16
B.
0.316
C.
2 020
D.
105
Answer:
B.) 0.316
Explanation:
To find the moles, you need to multiply the given value by the molar mass. The molar mass is made up of each element's atomic mass times their quantities. It is important to arrange the conversion in a way that allows for the cancellation of units.
Atomic Mass (S): 32.065 g/mol
Atomic Mass (O): 15.998 g/mol
Molar Mass (SO₃): 32.065 g/mol + 3(15.998 g/mol)
Molar Mass (SO₃): 80.059 g/mol
25.3 grams SO₃ 1 mole
------------------------- x ------------------------- = 0.316 moles SO₃
80.059 grams
2C6H6(g) + 15O2(g) = 12CO2(g) + 6H2O(g)
2.0 moles C6H6 reacts with oxygen according to the reaction above. What volume of water vapor forms at STP?
Taking into account the reaction stoichiometry and STP conditions, Finally, a volume of H₂O of 134.4 L will be formed at STP.
Reaction stoichiometryIn first place, the balanced reaction is:
2 C₆H₆ + 15 O₂ → 12 CO₂ + 6 H₂O
By reaction stoichiometry, the following amounts of moles of each compound participate in the reaction:
C₆H₆: 2 molesO₂: 15 molesCO₂: 12 molesH₂O: 6 molesSTP conditionsStandard pressure and temperature conditions are a set of standard pressure and temperature conditions for laboratory experimental measurements that are established to allow comparisons between different sets of measured data.
Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.
Volume of H₂O formedBy reaction stoichiometry 2 moles of C₆H₆ form 6 moles of water or H₂O.
Now, you can apply the following rule of three: if by definition of STP conditions 1 mole of H₂O occupies a volume of 22.4 liters, 6 moles occupies how much volume?
volume= (6 moles× 22.4 L) ÷ 1 mole
volume= 134.4 L
Finally, 134.4 L of H₂O will be formed.
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Heat is added to 1. 81 kg of ice at -19 °c. how many kilocalories are required to change the ice to steam at 152 °c?
Answer:
1363.2 kilocalories
Explanation:
Heat up the ice ==> melt the ice to water ==> heat the water ==> vaporize the water to steam ==> heat the stem 52 degrees to 152
1.81 kg * (spec heat of ice * 19 +* heat of fusion of water + specific heat of water *100 + heat of vaporization of water + specific heat of steam* 52)
1810 g * ( .50 cal/g -C * 19 C + 79.7 cal / g + 1 cal/g-C *100C + 539 cal/g + .48 cal/g * 52 C ) = 1 363 219.6 calories
(check my math)
Which of the following is always equal on each side of a balanced chemical equation?
Select one:
O a. The total number of ions.
Ob. The total number of molecules.
Oc. The total number of atoms of each element.
Od. The total number of different chemical compounds.
Answer:
the total number of molecules
Answer:
C.) The total number of atoms of each element.
Explanation:
An equation is balanced when there is an equal amount of each element on both sides of a reaction. If these values are not identical, they can be changed by adding coefficients to alter the amount of each molecule. By modifying the amount of molecules within the reaction, you can make the total number of atoms of each element equal on both sides.
How does ion exchange work? Why does it remove calcium ions (ca2+ ) and magnesium ions (mg2+ ) from hard water?
By exchanging them with sodium (or potassium) ions, cation exchange water softeners eliminate the calcium and magnesium ions present in hard water.
Ion exchange in water:
Ion exchange is the reversible exchange of ions, or charged particles, with other ions that have a similar charge. This happens when ions with a comparable charge that are present in the surrounding solution effectively switch places with ions that are located on an insoluble IX resin matrix.
The ion exchange procedure eliminates the water's enduring hardness. Hardness is eliminated in this technique through the use of resins. Cl- and anion exchange resin are used to exchange Ca++/Mg++ ions and SO4-2 ions (RNH2OH). The ion exchange procedure totally removes all of the total dissolved solids.
In ion exchange, calcium and magnesium, which are hardness ions, are removed and replaced with non-hardness ions, usually sodium, which is provided by dissolved sodium chloride salt, or brine.
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A compound composed of 3. 3% h, 19. 3% c, and 77. 4% o has a molar mass of approximately 60 g/mol. What is the molecular formula of the compound?.
The molecular of the compound will be-(H₂CO₃)1= H₂CO₃
The given molecule has the molecular formula H2CO3, also known as Carbonic acid.
Given that-
Consequently,
H= 3.3%.
C=19.3%
O =77.4%
Number of H moles = 3.3/1 = 3.3
Number of C moles = 19.3/12 = 1.60
Number of O moles = 77.4/16 = 4.83
As a result, the ratio of C, H, and O atoms is 3.3: 1.60: 4.83.
Divide by the amount you obtain that is the smallest: 3.3/1.60; 1.60/1.60; 4.83/1.60 = 2: 1: 3
H2CO3 is the empirical formula.
Let (H2CO3)n be the molecular formula.
A molecular formula is a chemical formula that specifies how many atoms of each element there are in each molecule of a given substance.
Molar mass thus equals (21+112+3X16)n = 62n.
As per the inquiry, 62n = 60
alternatively, n= 0.96 (round figure is 1)
Therefore, carbonic acid is the chemical whose molecular formula is (H2CO3)1=H2CO3.
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QUESTION 1 Consider the following diagram that shows liquid water evaporating to form water vapour. Evaporation 1.1. Use chemical formulae to represent the process in the diagram above and indicate the phases of the substance undergoing this process (2) 1.2. Give three separation methods that can be used to reverse a physical change. (3)
The process of evaporation by which liquid water changes to vapor is shown by a chemical formulae as follows:
H₂O (l) → H₂O (g)Three separation methods that can be used to reverse a physical change include:
EvaporationCrystallizationFiltrationWhat is evaporation?Evaporation is the process by which liquids changes to vapor or gas spontaneously.
The rate of evaporation of a liquid increases with increase in temperature of the liquid. The rate of evaporation also increases with increase in surface area of the liquid exposed as well as with increase in wind speed.
The process by which liquid water changes to vapor can be represented by chemical formulae as follows:
H₂O (l) → H₂O (g)
In the equation above, the liquid phase of water, l, is undergoing change to gaseous phase, g.
b. Separation techniques are techniques which are used to separate mixtures of substances.
Three separation methods that can be used to reverse a physical change include:
Evaporation - used to separate a mixture of salt and waterCrystallization - used to separate a crystal solute from solutionFiltration - used to separate a solute from its suspensionIn conclusion, physical changes are those changes that are easily reversible and which no new products are formed.
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What mass of copper could be electroplated on the cathode in an experiment where an average of 200 ma was passed through the cell for 35 minutes?
There are 0.138 gram copper could be electroplated on the cathode in an experiment where an average of 200 ma was passed through the cell for 35 minutes .
Calculation ,
Given ; Current passed through copper ( I ) = 200 mA = 200×[tex]10^{-3}[/tex] A
time in second = 35 minutes×60 = 2100 sec
Current ( I )= Q/t
Q =It = 200×[tex]10^{-3}[/tex] A × 2100 sec = 420 C
96500 C of charge = 1 mole
420 C of charge = 1 mole ×420 C/ 96500 C = 0.00435 mol
In , the valancy of Cu is +2 .
2 moles of electron are required for the decomposition of 1 mole of Cu on the cathode .
0.00435 mol of electron are required for the decomposition of Cu = 1mol × 0.00435 mol/2 = 0.002175 mol of Cu
Number of moles of Cu = given mass / molar mass
Mass of Cu = Number of moles of Cu × molar mass = 0.002175 ×63.546
Mass of Cu = 0.138 gram
Therefore , mass of copper is 0.138 gram
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What happened to the molecule when the electron was promoted to the antibonding orbital?.
the bond will break
The bond will dissolve (break) if the electron absorbs a photon and is moved from a bonding molecular orbital to an antibonding orbital since there is no longer an overall stabilizing interaction.
What is an antibonding orbital?An antibonding molecular orbital is the molecular orbital created by the destructive overlapping of atomic orbitals.
Why is it called antibonding orbital?Every atom will add one electron to the bond that makes up the lower energy bond. To prevent interacting with the other two electrons, the additional electron will occupy a higher energy state. The antibonding orbital is the name of this higher energy orbital.What orbitals form an antibond?The bonding orbitals are home to electrons that spend the majority of their time between the nuclei of two atoms, whereas the antibonding orbitals are home to electrons that spend the majority of their time outside the nuclei of two atoms.When an electron was elevated to the antibonding orbital, what happened?In contrast, putting electrons in antibonding orbitals will make the molecule less stable. The energy levels of the orbitals will determine how many electrons are filled. The lower energy orbitals will be filled first, and then the higher energy orbitals.To learn more about antibonding orbitals visit:
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WHAT IS PRECIPITATION REACTION
A precipitation reaction exists in which dissolved substances react to create one (or more) solid products.
What is a Precipitation in a Reaction?A precipitation reaction exists in which dissolved substances react to create one (or more) solid products. Many reactions of this kind concern the exchange of ions between ionic compounds in an aqueous solution and exist sometimes directed as double displacement, double replacement, or metathesis reactions.
A precipitation reaction exists as a chemical reaction happening in an aqueous solution where two ionic bonds integrate, resulting in the construction of an insoluble salt which is named precipitates.
Some examples exist reactions between calcium chloride (CaCl2) and potassium hydroxide(KOH), which result in the appearance of calcium hydroxide which stands as an insoluble salt. The reaction between silver nitrate (AgNO3) and sodium chloride (NaCl), results in the construction of silver chloride (AgCl) exists an insoluble salt.
In an aqueous solution, precipitation stands the procedure of converting a dissolved substance into an insoluble solid from a super-saturated solution. The solid formed exists named the precipitate.
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In a chemical hot pack, iron powder and oxygen react to form iron oxide in the presence of a catalyst. This reaction causes the temperature of the hot pack to increase. This process is
Answer:
exothermic
Explanation:
exothermic reactions give off heat.....or the temp of the substances increases
what do chemical and physical change have in common?
Explanation:
The similarities between chemical and physical changes include change in state of matter and both process involve change in energy.
Chemical changes of a substance results in the formation of entirely new substances. These changes are not reversible.
Physical changes results in the change of the state of the substance which can be reversed.
However, both chemical and physical changes results in change of state of matter and both process results in change in energy.
Thus, we can conclude that the similarities between chemical and physical changes include change in state of matter and both process involve change in energy.
(it's alre answered but here it again 'NOTE: not my answer')
A gas has a volume of 27. 5 L at 302 k and 1. 40 atm. How many moles are in the sample of gas?
There are 1.554 moles are in the sample of gas when a gas has a volume of 27. 5 L at 302 K and 1. 40 atm.
Calculation,
The given question is solved by the using of ideal gas equation which is shown below.
PV = nRT .... ( i )
where , P is he pressure of the gas = 1. 40 atm
V is the volume occupied by the gas = 27.5 L
R is the universal gas constant = 0.082 L atm/K mol
T is the temperature = 302 K
n is he number of moles of the gas = ?
By putting the value of pressure P , volume V , Universal gas constant and temperature T in the equation ( i ) we get the number of moles.
1. 40 atm × 27.5 L = n × 0.082 L atm/K mol× 302 K
n = 1. 40 atm × 27.5 L/0.082 L atm/K mol× 302 K = 1.554 mole
There are 1.554 moles are in the sample of gas
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What would it mean if you added liquid bromine to your final transfer hydrogenation product and the resulting mixture converted from dark maroon to clear upon heating?
For breaking alkenes, liquid bromine was utilized. When liquid bromine is added to the finished product and it turns clear, it has reacted.
The principal test used to determine the organic compound's unsaturation in a qualitative examination of organic compounds is the bromine water test. It aids in determining the compound's functional group.
Unsaturated hydrocarbons and bromine water engage in an additional process. When the double bond breaks, bromine is added. The reaction's final result has no color.
However, there is no addition reaction when bromine water combines with saturated hydrocarbons. As a result, the solution's hue is unchanged and remains brown.
So, a qualitative test for saturated and unsaturated hydrocarbons is a reaction with liquid bromine.
The presence of unsaturated hydrocarbons, or functional groups with double bonds, can be seen in the mixture when it transforms into a clear
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24. 00 ml of a 0. 25 m naoh solution is titrated with 0. 10m hcl. What is the ph of the solution after 24. 00 ml of the hcl has been added?.
The pH of the solution is 12.88.
Calculation:
millimoles of NaOH = volume x Molarity
= 24.00 mL x 0.25 M
= 6.00 mmole
millimoles of HCl = 24.00 mL x 0.10 M
= 2.40 mmole
Total volume = 48.00 mL
NaOH + HCl → NaCl + H2O
initial 6.00 0 0 0
added 2.40
change -2.40 -2.40 +2.40 +2.40
equilibrium 3.60 0 2.40 2.40
The pH is determined by the excess of NaOH present.
[NaOH] = millimoles/volume
= 3.60/48.00
= 0.075 M
pOH = -log (OH⁻).
= -log (0.075)
= 1.12
Then
pH + pOH = pKw = 14.00.
pH = 14 - pOH
pH = 14 - 1.12
pH = 12.88
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PLEASE HELP ASAP for 75 points
A 5.00 L flask is charged with 63.45 grams of I₂ and 2.5 atm of F₂ at 25°C. The flask is heated to 100°C until one of the reagents is completely consumed. What will be the total pressure (in atm) of the final products in the flask at 100°C?
Based on the calculations, the total pressure of the final products is equal to 1.76 atm.
How to calculate the total pressure (in atm)?From the information provided about this chemical reaction, we can logically deduce the following parameters:
Volume, V = 5.00 L.Mass, m of I₂ = 63.45 grams.Pressure, P of F₂ = 2.5 atm.Initial temperature, t₁ = 25°C.Final temperature, t₂ = 100°C.Next, we would write the properly balanced chemical equation for this chemical reaction:
I₂ + 5F₂ ⇒ 2IF₅
Also, we would determine the number of moles of each atom of I₂ and F₂:
[tex]Number \;of \;moles = \frac{mass}{molar\;mass}[/tex]
Substituting the given parameters into the formula, we have;
Number of moles = 63.45/253.8
Number of moles = 0.25 moles.
Assuming I₂ were limiting, we would need:
5 × 0.25 = 1.25 moles of F₂.
For fluorine gas, we have:
PV = mRT/MM
Mass, m = PVMM/RT
Mass, m = 2.5(5.00)(38)/(0.0821 × 298)
Mass, m = 475/24.4658
Mass, m = 19.42 grams.
Number of moles = 19.42/38
Number of moles = 0.51 moles.
The total number of moles = 0.25 + 0.51 = 0.76 mol.
For the mole fraction of I₂, we have:
Mf = 0.25/0.76
Mole fraction = 0.33.
For the mole fraction of F₂, we have:
Mole fraction = 1 - 0.33 = 0.67.
Next, we would determine the total pressure of the two elements by applying Dalton's law:
Total pressure = 0.33 × 0.27 + 0.67 × 2.5
Total pressure = 1.76 atm.
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What type of compound results from the reaction of an acid chloride and a 2° amine?
Amide is produced when a 2° amine and an acid chloride combine.
Acid chloride: What is it?
The chemical name for acid chloride is RCOCl, where "R" stands for a side chain. They are reactive derivatives of carboxylic acids. In organic chemistry, an acyl group and a chlorine atom form an organic molecule known as an acyl chloride (also known as acid chloride). A functional group identified by the RCO molecular formula is called an acyl group. Since acyl chlorides are often hazardous, handling them requires extra care. They have the potential to produce HCl and organic compounds when they interact with water on the surface of the eye, irritating the eye. Anhydrous acid salts are neutral because it lacks an H+ donor.Learn more about acid chloride here:
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If we combine the reaction of an acid protonating water and the reaction of its conjugate base deprotonating water, the net reaction after canceling common terms is:_________
After eliminating common terms, the net reaction occurs when we combine the reactions of an acid protonating water and its conjugate base deprotonating water is the autoionization of water.
What is the autoionization of water?The autoionization of water demonstrates that water can react with itself because acids and bases should interact with one another.
Here, the sound should be strange. Additionally, the water molecules should experience a small degree of proton exchange.
Thus, the correct option is c. The autoionization of water.
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The question is complete. Your complete question is given below:
a. The acid-base reaction between the acid and its conjugate base.
b. The synthesis of a complex between the acid and its conjugate base.
c. The autoionization of water.
d. None of the above.
How many milliliters of an 16m (h2so4) solution is required to prepare 2. 0×10^3ml of 0. 15m solution?
18mL of a 16M H₂SO₄ solution is required to prepare.
Dilution is the process of lowering a solute's concentration in a solution. It usually just involves mixing the solution with more solvent, and much more water. A solution is diluted when more solvent is added without increasing solute. The final mixture is thoroughly mixed to make sure that every component is the same.
The formula for the dilution of a solution is
M₁V₁ = M₂V₂
where,
M is molarity and V is the volume of the solution in liters.
Known,
M₁ = 16M = 16 mol/ L
M₂ = 0.15M = 0.15 mol / L
V₂ = 2.0 × [tex]10^3[/tex] ml
= 2L
∴ [tex]V_1 =\frac{M_2 V_2}{M_1}[/tex]
[tex]V_1 = \frac{0.15 * 2}{16}[/tex]
[tex]= \frac{0.3}{16}[/tex]
[tex]= 0.018 L[/tex]
[tex]V_1 = 0.018L[/tex] × [tex]1000 mL[/tex]
[tex]= 18 mL[/tex]
Therefore, 18mL of a 16M H₂SO₄ solution is required to prepare.
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The use of phenol (carbolic acid) as a surgical wound disinfectant was first practiced by?
The use of phenol (carbolic acid) as a surgical wound disinfectant was first practiced by Joseph Lister.
Who was Joseph Lister?
Joseph Lister was a surgeon, scientist, pathologist, etc. He was famous for the discovery of the prevention of infection in wounds. He first used phenol as a disinfectant agent for wounds.
Phenol is an inorganic compound, it is white crystalline and solid. It was used by Joseph Lister as an agent for a disinfectant agent. He discovered the safer medical procedure.
Thus, Joseph Lister was the first to utilize phenol (carbolic acid) to sterilize surgical wounds.
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Compared to a solution with a ph value of 7, a solution with a thousand times greater hydronium ion concentration has a ph value of.
Answer:
pH = 4
Explanation:
pH is a base 10 logarithmic scale
1000 = 10^3
7 -3 = pH = 4
What impact would adding twice as much na2co3 than required for stoichiometric quantities have on the quantity of product produced?
The product will not be affected by the addition of twice as much Na₂CO₃.
What is Limiting reagent in stoichiometry ?The maximum quantity of the end product determined by a balanced chemical equation is known as the Stoichiometry.The limiting reactant is the one that is consumed first and sets a limit on the quantity of product(s) that can be produced, and the one which remains unconsumed after the final reaction is in Excess.Calculate the moles of each reactant present and contrast it with the mole ratio of the reactants in the balanced equation to determine which reactant is the limiting one.Here,taking the stoichiometry into consideration, we find that the reaction happens with 1:1 ratio; so, adding twice the amount of Na₂CO₃ will lead to its excess making the other the limiting reactant, hence, it would not affect the yield of the product.
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The major product expected from the sequential reaction of cyclopentene with br2/h2o, followed by sodium hydroxide is:
The major product expected from the sequential reaction of cyclopentene with [tex]Br_{2} /H_{2} O[/tex] , followed by sodium hydroxide is cyclopentene epoxide.
The treatment of cyclopentene with [tex]Br_{2} /H_{2} O[/tex] which is known as bromine water is an electrophilic substitution reaction.
In the first step the bromine molecule and the water molecule reacts each other and leads to formation of the bromohydrines . After that bromohydrines will break and we get halide anion i.e., bromine anion because bromine is more electronegativity and hydrin as a cation.
The cyclopentene will react with bromohydrin to give trans-2-bromopententanol and after reaction with base it give cyclopentane epoxide .
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If you start with 227.8 grams of iron and 128 grams of oxygen to produce iron oxide, what is the limiting reagent? you will need to balance the equation first. don't forget that oxygen is diatomic (o 2 ) when finding the molar mass. fe o2 -> fe2o3
Fe is the limiting reactant.
The balanced chemical equation between iron and oxygen to produce iron (III) oxide is
4Fe(s) + 302(g) - ---> 2Fe2O3(s)
Mass of Fe = 227.8 g
Moles of Fe = 227.8gFe*Imol Fe/55.85g Fe = 4.079mol Fe
Mass of oxygen = 128 g
Moles of O2 = 128g02 * 1molo/32g02 = 4molO2
Calculating the limiting reactant: The reactant that produces the least amount of product will be the limiting reactant.
Mass of iron (III) oxide produced from Iron = 4.079mol Fe*2molFe2O3/4molFe*159.69g Fe2O3/1 mol Fe2O3 = 325.7gFe2O3
Mass of iron (III) oxide produced from oxygen = 4molO2 *2mol Fe2O3/3molO2*159.69gFe2O3/1mol Fe2O3 = 425.84gFe2O3
Iron (Fe) produces the least amount of the product iron (III) oxide. So, Fe is the limiting reactant.
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A solution has a poh of 7. 1 at 10∘c. what is the ph of the solution given that kw=2. 93×10−15 at this temperature? remember to report your answer with the correct number of significant figures
A solution has a pOH of 7. 1 at 10∘c. Then the pH of the solution given that kw=2. 93×10−15 at this temperature is 7.4 .
It is given that,
pOH of solution = 7.1
Kw =2.93×10^(-15)
Firstly, we will calculate the value of pKw
The expression which we used to calculate the pKw is,
pKw=-log [Kw]
Now by putting the value of Kw in this expression,
pKw =−log{2.93×10^(-15)}
pKw =15log(2.93)
pKw=14.5
Now we have to calculate the pH of the solution.
As we know that,
pH+pOH=pKw
Now put all the given values in this formula,
pH+7.1=14.5
pH=7.4
Therefore, we find the value of pH of the solution is, 7.4.
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A 25. 0-ml sample of 1. 00 mnh3is titrated with 0. 15 mhcl. what is the ph of the solution after 15. 00 ml of acid have been added to the ammonia solution? kb= 1. 8 10-5
The pH can be determined by the base dissociation constant value (Kb). The pH of the solution after 15 mL of ammonia is added to the solution will be 10.26.
What is pH?The pH of the solution can be given by the pOH value that is determined by the concentration and the base dissociation constant.
The balanced chemical reaction is given as,
HCl + NH₃ → NH₄Cl
The moles before reaction was 0.015L× 0.15M = 0.00225 moles and, 0.025 L × 1.00 M = 0.025 moles
The moles after reaction are 0.00225 moles - 0.025 moles = 0.02275 moles
pOH is calculated as,
pOH = 4.74 + log ( 0.00225 ÷ 0.02275 )
= 3.73
Further pH is calculated as,
pH = 14 - 3.73
= 10.26
Therefore, 10.26 is the pH of the solution.
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Calcium oxide, cao, also known as quick lime, may react with carbon dioxide to form calcium carbonate, caco3. which acts as a lewis acid in the reaction?
When calcium oxide react with carbon dioxide to form calcium carbonate then carbon dioxide would react as a Lewis acid in the reaction.
A chemical species known as a Lewis acid has an empty orbital that can accept a pair of electrons from a Lewis base to produce a Lewis adduct.
In the reaction, orbital of carbon dioxide will be vacant orbital that's why it can be considered as Lewis acid.
Its reaction can be written as:
[tex]CaCO_{3}[/tex] → CaO +[tex]CO_{2}[/tex]
It is kind of decomposition reaction.
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The chance of recurrence of a polygenic trait based on its known incidence in a particular population refers to _____.
The chance of recurrence of a polygenic trait based on its known incidence in a particular population refers to continuous variation
Polygenic is a trait that is controlled by a group of non-allelic genes. For example, humans can be many different sizes. Height is a polygenic trait, controlled by at least three genes with six alleles. If you are dominant for all of the alleles for height, then you will be very tall. Skin color is also a polygenic trait, as are hair and eye color. A trait that is controlled by a group of non-allelic genes.
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