For a given sample of ch3oh , the enthalpy change during the reaction is 82.7 kj. The mass of the methane gas will be 32 gram.
When methanol will provide some temperature, then it will break into methane and oxygen gas and release some amount of energy.
The balanced chemical equation can be written as:
[tex]2CH_{3}OH[/tex]→ [tex]2CH_{4} + O_{2}[/tex], ΔH= 82 kJ
It can be seen that 2 mole of methane will produce 82 kj energy.
Hence, the energy of 82.3kj the count of mole could be = (2×82.3)/82
= 2 moles
The mass will be equivalent to the = 2 × 16 = 32 g
Therefore, the mass of [tex]CH_{4}[/tex] produced will be 32g
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Which of the following is a regulating service provided by ecosystems?
Multiple choice question.
cross out
A)
the water cycle
cross out
B)
pollination
cross out
C)
food production
cross out
D)
natural resources
One of the regulating services provided by the ecosystem is pollination. Option B.
What are ecosystem services?Ecosystem services are natural processes that are maintained by the ecosystem but which benefit man and mankind.
There are different types of services offered by the ecosystem and that benefit man immensely. These are:
Provisional services: which include food, raw materials, drugs, and so on.Regulating services: including the regulation of important processes such as pollination, decomposition, carbon storage, etc.Cultural service: non-material benefits that man derives from the ecosystem. Such as recreation, music, etc. Supporting services: such as water cycle, nutrient cycle, etc.The ecosystem plays a regulatory role in the pollination of plants for the benefit of mankind. Wind helps to carry pollens from the anther to the stigma of flowers. By doing so, fruits, vegetables, seeds, etc, become available for the use of man.
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this table shows the acceleration due to gravity on four different planets what planet is a person standing on if the person has a mass of 85.0 kg and weighs 305 N mercury is 3.59 Venus 8.87 Earth 9.81 mars 3.77
A.mercury
B.Venus
C.earth
D. Mars
Option C. The character has a mass of 85. zero kg and weighs 305 N mercury is three.59 Venus is eight.87 Earth is 9. eighty-one mars three.77: C.earth
Earth is expected to be 4.54 billion years old, plus or minus about 50 million years. Scientists have scoured the Earth looking for the oldest rocks to radiometrically date. In northwestern Canada, they determined rocks approximately four.03 billion years vintage.
The earliest existence on earth might have been just as purple as its miles green nowadays, a scientist claims. ancient microbes might have used a molecule other than chlorophyll to harness the solar rays, one which gave the organisms a violet hue. The third planet from the sun, Earth is the handiest region in the acknowledged universe shown to host existence. With a radius of 3,959 miles, Earth is the 5th largest planet in our sun machine, and it's the handiest one regarded as positive to have liquid water on its floor. Earth is also unique in phrases of monikers.
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(1) what is the element with an electron configuration of 1s22s22p63s23p64s23d1? fill in the blank 1 (2) what is the element with an electron configuration of 1s22s22p3?
The first element whose atomic number is 21 is Scandium and the second element whose atomic number is 7 is Nitrogen. Based on electronic configuration
Electronic configuration is a systematic way of distributing the electrons in their orbitals Electron configurations of atoms follow a standard notation in which all electron-containing atomic subshells (with the number of electrons they hold written in superscript) are placed in a sequence.
Electron Configurations are useful for:
Determining the valency of an element.
Predicting the properties of a group of elements (elements with similar electron configurations tend to exhibit similar properties).
Interpreting atomic spectra.
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how many electrons does it take to fill the mos formed from the combination of the 3s orbitals of two atoms?
The number of electrons it take to fill the mos formed from the combination of the 3s orbitals of two atoms simply is 14 electrons.
How electrons are distributed in the 3s orbitals.The 3s orbital possess two different spherical nodes which is highly connected with the principal quantum number. In order words, it has 2 radial nodes. Also the shape of the 3s orbital is spherical in shape.
That being said, from the context of the above given task, the number of electrons which fill the mos formed from the combination of the 3s orbitals of two atoms is fourteen electrons.
However, the electron configuration of an atom simply is the arrangement of electrons in the electron shell or orbit of the atom of that element.
In conclusion, it can be deduced from above s orbital has a maximum of two electrons and this energy increases as the orbitals increases.
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The earth’s magnetic poles are in the general direction of the planet’s geographic poles. However, unlike the geographic poles, the magnetic poles are not always in the same place.
As used in the text, what does the phrase "general direction" mean?
(A) different but the same exact way
(B) similar but complete opposite way
(C) similar but not the same exact way
(D) different and complete opposite way
The earth’s magnetic poles are in the general direction of the planet’s geographic poles. the phrase "general direction" mean different and complete opposite way.
What is difference between magnetic pole and geographic pole ?A bar magnet that is suspended freely will always point north-south. This is a result of the bar magnet's south pole being drawn to the Earth's magnetic north pole (geographic south).
Geographic and magnetic poles on Earth are generated by various sources, thus they are not perfectly aligned. The outer core's swirling currents of liquid iron are what generate the Earth's magnetic field.
Thus, Option D is correct.
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an important intermediate reaction in the industrial production process of nitric acid is shown. what is the theoretical yield of h2o (18.02 g/mol) if 45.0 kg of nh3 (17.04 g/mol) reacts with excess o2 (32.00 g/mol)?
The theoretical yield of H₂O in this reaction is 31.69 Kg.
The chemical equation of the reaction of NH₃ and O₂ is,
NH₃ + O₂ → NO + H₂O
Now, balancing this equation,
4NH₃ + 5O₂ → 4NO + 6H₂O
So, as per reaction, we can see,
NH₃ is limiting reagent, hence it will decide the extent of products,
4 moles of NH₃ reacts completely with two oxygen to form 6 moles of water.
Moles = Mass reacted/formed/molar mass.
Molar mass of NH₃ = 17.04 g/mol
Reacted mass of NH₃ = 45000 g.
Molar mass of H₂O is 18 g/mol
Now, can write,
4 x (mass of NH₃ reacted/molar mass of NH₃) = 6 x (mass of H₂O formed/molar mass of H₂O)
4 x (45000/17.04) = 6 x (Formed mass of H₂O/18)
Formed mass of H₂O = 31690.14 grams.
Formed mass of H₂O = 31.69 Kg.
So, the theoretical yield of H₂O is 31.69 Kg.
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equal volumes of equimolar solutions of ammonium iodide, nh4i, and lead (ii) acetate, pb(ch3coo)2, were combined and a precipitate forms.
Equal volumes of equimolar solutions of ammonium iodide, NH₄I, and lead (ii) acetate, Pb(CH₃COO)₂, were combined and a precipitate forms. The balanced equation is given as :
2NH₄I + , Pb(CH₃COO)₂ ----> PbI₂ + 2NH₄CH₃CO₂
The ammonium iodide, NH₄I react with lead (ii) acetate, Pb(CH₃COO)₂ to form lead(II)iodide and ammonium ethanoate. The balanced equation is given as follows :
2NH₄I + Pb(CH₃COO)₂ ----> PbI₂ + 2NH₄CH₃CO₂
ammonium lead (ii) acetate lead(II)iodide ammonium ethanoate
iodide
Thus, Equal volumes of equimolar solutions of ammonium iodide, NH₄I, and lead (ii) acetate, Pb(CH₃COO)₂, were combined and a precipitate forms. The balanced equation is given as :
2NH₄I + , Pb(CH₃COO)₂ ----> PbI₂ + 2NH₄CH₃CO₂
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(100 POINTS) Compare the forces between particles solids, liquids, gases
While solids have certain shape and volume, liquids only have definite volume but not shape, gases neither have shape nor volume. The level of energy is highest in gases, medium in liquid and lowest in solids. The compression of solids is difficult, liquids are nearly incompressible, but gases can be easily compressed.
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Based on the Law of Conservation of Mass, what mass of products form when baking soda decomposes?
The mass of the products form when baking soda decomposes is 25.00 grams
How do I determine the mass of the products?We can determine the mass of the products formed by simply observing the law of conservation matter (mass). Details below
The law of conservation of matter states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.
Thus, for every balanced chemical equation, total mass of reactants must equal to the total mass of the product obtained.
With the above information, we can detertmine the mass of the products obtained as follow:
2NaHCO₃ → Na₂CO₃ + H₂O + CO₂
Mass of reactant = Mass of product
Mass of NaHCO₃ = Mass of (Na₂CO₃ + H₂O + CO₂)
25.00 g = 25.00 g
Thus, the mass of the products is 25.00 g
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how do you write a chemical equation for a chemical reaction
The ways to write a chemical equation for a chemical reaction are:
Determine the reactant and product types.Each of the reactants and products should have a chemical formula, so write it down.Find out how many of each kind of atom there are in the reactants and products.Equilibrate the variables (Balance the equation)What is the term chemical reaction?
In a chemical reaction, reactants undergo a chemical reaction and transform into products through a chemical process. For instance, By inhaling oxygen, which then combines with glucose to produce carbon dioxide, water, and energy, we are able to breathe. The response is provided below. C6H12O6 + O2 = 6CO2 + 6H2O + Energy.
Note that Reactants are the substances that are changing and are written on the left-hand side of the equation. Products are the newly produced substances.
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why is it not possible to test for ammonia as evidence of nitrate reduction to ammonia in the nitrate broth culture
Ammonia as proof that nitrate was converted to ammonia in the cultivation of nitrate broth Because amino acids are produced during protein synthesis, amino acid metabolism will always exist.
Nitrifying microorganisms in the soil change ammonia into nitrates. Nitrates are taken up by plants from the soil and used to assemble proteins. Animals may consume the plant, and its biomass may be used to produce animal protein.
The process of nitrate (NO3) being used as an electron acceptor for respiration microbes results in dissimilatory nitrate reduction to ammonium (DNRA), also known as nitrate/nitrite ammonification.
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what wavelength of light (in nm ) is emitted when the electron in a hydrogen atom relaxes from the n
102 nm wavelength of light is emitted when the electron in a hydrogen atom relaxes from n= 3 to n= 1
∆E = - Rh × ( 1/nf² - 1/ni² )
∆E = difference in energy between final and initial energy level (J )
R = Rydberg's constant
nf = final energy level
ni = initial energy level
nf = 3, ni = 1, Rh = 2.18 × 10-¹⁸
∆E = -2.18 × 10-¹⁸ ( 1/3² - 1/1² )
= 2.18 × 0.88 × 10-¹⁸ J
∆E = 1.93 × 10-¹⁸ J
∆E = hf = hc / λ
λ = (h × c) / ∆E
= ( 6.625 × 10-³⁴ × 3 × 10⁸) / 1.93 × 10-¹⁸
= 19.878 × 10-²⁶ / 1.93 × 10-¹⁸
= 10.299× 10-⁸
= 102.99×10-⁹
= 102 nm
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what is the trend in electronegativity going from left to right in a row of the periodic table? how do electronegativity values generally vary going down a column in the periodic table? are the most easily ionizable elements the most electronegative? complete the sentences to explain your answers.
The electronegativity going from left to right in the periodic table increases from left to right in the row of the periodic table
electronegativity decreases down the column.
The most ionizable elements are not the most electronegative.
Electronegativity increases from left to right this is because the number of protons in the nucleus increases as you move from left to right on the periodic table. As a result, the electron affinity increases from left to right on the periodic table.
Electronegativity decreases down the group because when we move down the group the atomic size increases and the effective nuclear decreases
The most ionizable cannot be more electronegative as they lose their outer electrons to be ionized while electronegative gain an electron to be stable.
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which one of the following statements is false? group of answer choices water is the most important greenhouse gas. water plays the greatest role in the thermal regulation of the atmosphere the amount of energy absorbed when water evaporates is large due to its strong intermolecular forces. water molecules absorb energy when water vapor condenses to form clouds.
The correct statement is " water molecules absorb energy when water vapor condenses to form clouds".
Condensation, which is the opposite of vaporization, would be the transformation of matter from its gaseous state into its liquid state. The water cycle is the most frequent use of the phrase.
One such illustration is the condensation that accumulates on a chilly cup's exterior or on a car's windows on a cool night. Dew, vapor, clouds, and the fog that see it when you exhale on a chilly day are more characteristics of condensation.
Therefore, the correct answer will be option (D).
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when butane, c4h10, undergoes combustion, it reacts with o2 to form co2 and h2o. how many moles of o2 are required to react completely with 10.6 moles of butane?
189.8 mol of O₂ are required to react completely with 10.6 moles of butane.
What are combustion reaction?An accident occurred when the Hindenburg, an airship filled with hydrogen, tried to land in New Jersey in 1937. 36 persons were killed when the airship was destroyed and the hydrogen instantly exploded in a massive explosion. The chemical process was straightforward: water was created when hydrogen and oxygen combined.
A hydrocarbon, a substance comprised only of carbon and hydrogen, is involved in numerous combustion reactions. Carbon dioxide and water are the byproducts of the burning of hydrocarbons. Since their combustion produces more amounts of heat energy, many hydrocarbons are use fuel. Gas grills frequently use propane (C3H8) as their fuel source. Propane is a gaseous hydrocarbon.
Reaction is:
C₄H₁₀ + [tex]\frac{13O_{2} }{2}[/tex] → 4CO₂ + 5H₂O
Given,
no. moles of butane = 29.2 mol
from the balanced chemical equation,
we can say that:
1 mol of C₄H₁₀ requires [tex]\frac{13}{2}[/tex] moles of O₂
29.2 mol of C₄H₁₀ requires [tex]\frac{13}{2}[/tex] × 29.2
⇒189.8 mol of O₂
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what volume in gas would be produced by the complete reaction of solid at stp according to the following reaction?remember mol of an ideal gas has a volume of lat stp.
3.648 liters of volume in gas would be produced by the complete reaction of solid at STP according to the reaction as 1 mole of an ideal gas has a volume of 22.4 L at STP.
How is the volume in gas calculated?The given reaction is
[tex]2 Al(s) + 6 HCl (aq)[/tex] = [tex]2AlCl[/tex]₃([tex]aq[/tex])[tex]+H[/tex]₂([tex]g[/tex])
1mole of ideal gas is 22.4L
Here we have to convert the mass of Al to moles.
We know, Number of moles = Mass/Molar mass
Mass of Al = 2.93 g
Molar mass of Al = 26.98 g
Therefore, No. of moles = 2.93 g/26.98 g = 0.108 moles
The molar ratio of Al to H₂ is 2:3
As, 2 moles of Al can produce 3 moles of H₂
Then, 0.108 moles of Al can produce
(0.108 × 3)/ 2
= 0.163 moles of H₂
Now by applying the Ideal Gases Law to calculate the volume that is been produced throughout the reaction at STP ,
The standard temperature is 273 K (0° Celsius or 32° Fahrenheit) and the standard pressure is 1 atmosphere.
1 atm × V = 0.163 mol × 0.082L.atm(mol.K)⁻¹ × 273K
Hence,
V = (0.163 mol × 0.082 L.atm(mol.K)⁻¹ × 273K) / 1atm
V = 0.013366 × 273
Therefore, the Volume is 3.648 L
What is STP?In chemistry, STP stands for Standard Temperature and Pressure. STP is most commonly used when doing gas calculations. B. Gas Density. The standard temperature is 273 K (0° Celsius or 32° Fahrenheit) and the standard pressure is 1 atmosphere. This is the freezing point of pure water at atmospheric pressure at sea level.
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true or false-an oxygen molecule (o2) has eight times as much mass as a hydrogen molecule (h2). for equal masses of oxygen and hydrogen at the same volume and the same temperature, the oxygen sample will exert more pressure than the hydrogen sample.
The oxygen molecule is 16 times heavier than the hydrogen molecule. So, the answer is false. The molar mass of gases decide the mass of the gases.
What is molar mass?
Molar mass is the mass of the substance divided by the number of moles of that substance. The SI unit of molar mass is Kg/mol. It is an intensive property. It is the mass of the substance in 1 mole of that substance.
The molar mass of hydrogen molecule (H2) is 2 g/mol. The molar mass of oxygen molecule (O2) is 32 g/mol. The oxygen molecule is heavier than hydrogen molecule.
Therefore the oxygen molecule has a molar mass of 32 g/mol which is 16 times more than the molar mass of hydrogen molecule which is 2 g/mol. The answer is false.
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true or false energy is released from ATP when it reacts with water to pro duce ADP
true or false the information that cells need to direct their metabolic process is stored in RNA
btw it biology
Answer:
False for the first, true for second.
Explanation:
ATP is cellular energy and it needs to be recharged after it is used. That half dead is called adp.
The statement energy is released from ATP when it reacts with water to produce ADP is False, while the statement the information that cells need to direct their metabolic process is stored in RNA is True.
What is ATP?ATP is the energy source of cells generated by cellular respiration and anaerobic processes, while RNA is a molecule obtain by the transcription process which is used to generate proteins during metabolic activities such as differentiation.
Therefore, with this data, we can see that ATP is the energy coin of cells, while cells generate RNA during transcription.
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Determine the mechanism and product for the given reaction by adding atoms, bonds, nonbonding electron pairs, and curved arrows. Acid and water are added in the second step.
The mechanism and product for the given reaction after adding acid and water in the second step will result in the production of phenylpropanol.
The missing reaction scheme of the question is attached as a picture:
As a result of the reaction between benzaldehyde with diethyl ether (Et2O) and MgBr an intermediate results. This intermediate then reacts with hydronium to produce phenylpropanol. The hydronium ion generates as a reaction between the water molecule and a strong acid. Acid donates its proton to the water molecule. This hydronium ion then donates this proton to the resulting intermediate. The complete mechanism is attached:
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what is the ph of a barium hydroxide solution obtained by dissolving 0.10 grams of barium hydroxide in enough water to obtain 250. ml of solution? (mm of ba(oh)2 is 171.3 g/mol)
The pH of a barium hydroxide solution obtained by dissolving 0.10 grams of barium hydroxide in 250ml of water is 17.
When barium hydroxide is dissolved in water, it forms,
Ba(OH)₂ → Ba⁺ + 2OH⁻
the concentration of the hydroxide ion in the solution will be,
Molarity = Moles of solute/volume of solution
Moles of Ba(OH)₂ = 2 moles of OH⁻
So, we can write,
0.10/171.3x2 =Moles of OH⁻
Moles of OH⁻ = 0.000291 moles.
Molarity of OH⁻ solution = 0.000291 x 1000/250
Molarity/concentration of OH⁻ solution = 0.001 mol/L
pH = 14 - p[OH]
p[OH] = log[0.001]
p[OH] = -3
pH = 14+3
pH = 17
So, the pH of the solution is 17.
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What is Electrovalant Bond?
Answer:
ionic bond, also called electrovalent bond, type of linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound. Such a bond forms when the valence (outermost) electrons of one atom are transferred permanently to another atom.
Explanation:
Can someone please answer these questions for me ??
Help!!
Predict the missing component in the nuclear equation.
The missing component in the nuclear equation is [tex]{{0} \atop {-1}} \right.[/tex]e.
Nuclear reactions are processes in which one or more nuclides are produced from the collisions between two atomic nuclei or one atomic nucleus and a subatomic particle. The nuclides produced from nuclear reactions are different from the reacting nuclei (commonly referred to as the parent nuclei).
In the given reaction in order to balance the reaction we can see that their mass numbers are same so the difference between them is = 0, and the difference in their atomic number is 91-90 = 1, hence the component is the [tex]\beta[/tex] particle that is formed.
This type of nuclear reaction is know as [tex]\beta[/tex]decay nuclear reactions
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For many purposes we can treat propane C3H8 as an ideal gas at temperatures above its boiling point of −42.°C Suppose the temperature of a sample of propane gas is raised from -28.0°C to 9.0°C, and at the same time the pressure is increased by 5.0%
The percent change in volume is 21 %.
given that :
temperature , T1 = 273 -28 = 245 K
temperature , T2 = 273 + 9 = 282 K
pressure P1 = P
pressure P2 = P - O.O5 P = 0.95 P
Volume V1 = V
volume V2 = ?
using ideal gas equation , we get :
P1 V1 / T1 = P2 V2 / T2
V2 = (P1 V1 T2 ) / P2 T1
V2 = ( P × V × 282 ) / ( 0.95 P × 245 P )
V2 = 1.211 V
change in volume is given as = V2 - V1
= 1.211 V - V
= 0.211 V
Percent change in volume is = (0.21 V)) / V ) × 100 %
= 21 %
Thus, For many purposes we can treat propane C3H8 as an ideal gas at temperatures above its boiling point of −42.°C Suppose the temperature of a sample of propane gas is raised from -28.0°C to 9.0°C, and at the same time the pressure is increased by 5.0% . the percent change in volume in 21 %.
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How many particles are in 0.75 moles of AgNO3?
Explanation:
Assume if its asking about molecule particle:
1 mol of AgNO3 = 6.022 x 10^23 molecules
0.75 mol of AgNO3 = 0.75 x 6.022 x 10^23
= 4.5165 x 10^23 molecules
Assume if its asking about atom particle:
AgNO3 has 5 elements
0.75 mol of AgNO3 = 0.75( 5 x 6.022 x 10^23)
= 2.2583 x 10^24 atoms
how would the experimental molecular weight be affected if a few drops of the titrant were stuck on the inside wall of the flask during the titration and not rinsed into the solution?
Drops of the titrant will adhere to the burette's walls, thus additional solution must be diluted into the analyte to make up for this. This will result in a higher volume reading (denominator), which will lower the molarity calculation.
What do you mean by titration?The titrant is a solution with a known concentration that is added to another solution in analytical chemistry to measure the concentration of a different chemical species. The standard solution, reagent, or titrant are other names for the titrant.
In contrast, the species of interest during a titration is the analyte, or titrand. The analyte concentration can be ascertained when it reacts with a titrant that has a known volume and concentration.
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What type of solution contains more solute than would normally dissolve at that temperature?
Super saturated solution is a term used to describe a solution that contains more solute than the saturated solution at a particular temperature.
What kind of solution liquefies a substance more quickly?Your solution is referred to as unsaturated if you can continue to add solute while it still dissolves. Your solution is saturated when it can no longer dissolve any more solute at a particular temperature.
What sort of solution exceeds the maximum solute concentration?A solution that, under the same circumstances, contains more dissolved solute than a saturated solution is said to be supersaturated. The link between temperature and a substance's solubility is displayed by a solubility curve.
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What is the mass concentration of 2mole HCL solution?(h=1,Cl=35.5)
Answer:
So the answer to the question “What is the mass concentration of hydrogen chloride in 2.0-molar hydrochloric acid?” is 73 grams per liter.
PLEASE HELP FAST
What is the chemical formula for the ionic compound formed by Na+ and N¯³
Responses:
NaN,
Na3N,
NaN3,
Na3N3
Answer:
The chemical formula for the ionic compound is
Na3N3
what would be the molar concentration of a 2.35% solution of sodium hypochlorite? (assume the density of solution to be 1.0 g/ml.)
The solution has a 0.114 M molar concentration.
Using the formula, we can determine the molar concentration from the weight percentage of the solution;
CM = 10 C%w/w d/MM
Where;
Molar concentration is CM,percent concentration C%w/w,Density is d,M = molecular mass.
In place of values, we have;
CM = 10 × 0.85 × 1.0 /74.44
CM = 0.114 M
A solution is a specific kind of homogenous mixture made up of two or more components that is used in chemistry. A solute is a substance that has been dissolved in a solvent is solution , which is the other substance in the mixture.Concentration is calculated by dividing a constituent's abundance by the mixture's total volume. One can distinguish between four different sorts of mathematical descriptions: mass concentration, molar concentration, number concentration, and volume concentration.
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