Answer:
d.-379 cal/mol
Explanation:
ΔG = ΔG⁰ + RT ln K
for equilibrium ΔG = 0
ΔG⁰ + RT ln K =0
ΔG⁰ = - RT ln K
PG ⇒ PEP
K = [ PEP ] / [ PG ]
= .68 / .32
= 2.125
ΔG⁰ = - 1.987 x 273 x ln 2.125
= - 409 Cal / mole
Option d is the nearest answer .
3. Nitrogen contains two naturally occurring isotopes, N-14 with a mass of 14.003 amu and N-15 with a mass of 15.000 amu. What are the percentages of the two isotopes in naturally occurring nitrogen?
Answer:
Explanation:
fe-45 and O-15 im sure :)
squence the steps in constructing and interpreting an electron dot diagram
Will Co(OH)2 precipitate from solution if the pH of a 0.020 M solution of Co(NO3)2 is adjusted to 8.5? ( Ksp of Co(OH)2 is 1.3×10−15 .)
TRUE CO(OH)₂ will precipitate from the solution if the pH of a 0.020 M solution of CO(NO₃)₂ is adjusted. ; ( TRUE )
Given that:
Ksp of CO(OH)₂ = 1.3 * 10⁻¹⁵
Chemical reaction
CO⁺² + 2OH ----> CO(OH)₂
First step : determine the pOH value
pOH of solution = 14 - pH
= 14 - 8.5 = 5.5
Also
pOH = - log [ OH⁻ ] = 5.5
Therefore : [OH⁻] = - Antilog ( 5.5 )
= 3.16 * 10⁻⁶
[CO⁺²] = 0.02 given that it is obtained from 0.02 M solution of cobalt nitrate
Next step : determine the Ionic product of cobalt hydroxide
Ionic Product ( IP ) = [CO⁺²] [OH⁻]²
= 0.02 * ( 3.16 * 10⁻⁶)²
= 1.99 * 10⁻¹¹
Given that the Ionic product is greater than the Ksp of CO(OH)₂ therefore CO(OH)₂ will precipitate
Hence we can conclude that TRUE CO(OH)₂ will precipitate from the solution if the pH of a 0.020 M solution of CO(NO₃)₂ is adjusted. ; ( TRUE )
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What would happen to the density of a mass of air that is heated?
Would that mass of air rise above and float on top of cooler air above it or would it sink down below cooler air below it? (Assume that the majority of the masses do not mix.)
Answer: As air is heated its density decreases because its mass remains constant but its volume increases. As air is cooled, its density increases because its mass remains constant but its volume decreases. ... The decrease in density as air is heated causes it to rise above cooler, more dense air. Hope this helped.
Which statement best describes a physical change?
O Changes can occur to certain chemical properties of the substance, but the overall shape of the substance will
remain the same.
Changes can occur to certain physical properties of the substance, but the overall shape of the substance will
remain the same.
O Changes can occur to physical properties of a substance, but the chemical composition of the substance remains
the same.
O Changes can occur to chemical properties of a substance, but the chemical composition of the substance remains
the same.
Answer:
Changes can occur to physical properties of a substance, but the chemical composition of the substance remains
Help please I need help fast.
Answer:
d) It incorrectly describes the two processes
Hope it helps you
And please mark it as the brainliest answer
The formula for the nitrate ion: NO3 NO2 NO3+
Answer:
NO3-
Explanation:
edge2020
no3-Edg 2020
Explanation
Brainliest
Two cities in Germany are located 25 km apart. What is the
distance in miles?
Answer:
15.5343
Explanation:
I’ll give the brainliest answer to whoever helps me with these!! I need them ASAP!
1. How many moles are in 3.63x10^11 atoms of Mt?
2. How many moles are in 5.96g of KNO3?
3. How many moles are in 1.50 grams of CH4?
4. How many liters are in 82.0g KBr?
Answer:
Your question will be shared anonymously with online publishers who may be interested in answering it
Explanation:
make me as brain
what is the mass percent of a solution prepared from 50.0g nacl and 150.0g of water
Answer:
Explanation:
In this problem, we have 50.0 g of solute and 150.0 g of water. The total mass of the solution will thus be 50.0 g + 150.0 g = 200.0 g. The mass percent will be 50.0g/200.0 g (x100%) = 25.0 %.
Mass percent of a solution can be defined as grams of solute per 100 grams of solution. In this problem, we have 50.0 g of solute and 150.0 g of water. The total mass of the solution will thus be 50.0 g + 150.0 g = 200.0 g. The mass percent will be 50.0g/200.0 g (x100%) = 25.0 %. You can also look at it another way. Since you have 50 g solute in 200 g solution, you will have 25 g solute in 100 g solution. By the definition provided above, this is a 25% by mass solution.
How do you determine the chemical reactivity for nonmetals by using the periodic table?
elements increase in reactivity as they go down in groups and up in periods!!
What's meant by chemistry
Answer: Chemistry is the properties, composition, and structure of elements and compounds, how they can change, and the energy that is released or absorbed when they change.
Explanation:
Answer:
The scientific study of the structure of substances and what happens to them in different conditions or when mixed with each other is known as Chemistry.
Please mark my answer the brainliest and rate me 5 star and follow me.Arrange the following ions in order of increasing ionic radius: nitride ion, magnesium ion, fluoride ion, aluminum ion.
Explanation:
Nitride ion > Fluoride ion > Magnesium ion > Aluminum ion
Write a balanced equation for each of the following decomposition reactions:
Solid stannous chlorate decomposes with heat to give stannous chloride and oxygen gas.
Sn(ClO3)2 -> SnCl2 + 3O2
Explanation: There should be equal amounts of each element on both sides. This assumes it’s referring to Sn 2+, and not Sn 4+.
The balanced chemical equation will be:
[tex]\rm \bold{(SnClO_3)_2\;\overset{\Delta}{\rightarrow}\;SnCl_2\;+\;3\;O_2}[/tex]
Stannous chlorate has been also known as Tin chlorate. The compound has been a white crystalline powder and has been used for the sensitization of the metal.
The decomposition of Stannous chlorate under the influence of heat has resulted in the formation of stannous chloride and oxygen gas.
The reaction can be given as:
[tex]\rm (SnClO_3)_2\;\overset{\Delta}{\rightarrow}\;SnCl_2\;+\;O_2[/tex]
The number of atoms on the reactant and the product side is not equal. By putting the coefficient to the compound, the reaction can be balanced. The balanced chemical equation will be:
[tex]\rm \bold{(SnClO_3)_2\;\overset{\Delta}{\rightarrow}\;SnCl_2\;+\;3\;O_2}[/tex]
For more information about the balanced chemical equation, refer to the link:
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Which representative element has the largest atomic radius ?
Answer:
francium
Explanation:
the atomic radius increases from top to bottom in a group, and decreases from left to right across a period.
1s22s22p63523p645230104p5
Which element is this?
answer : bromine
Answer:
indeed it 1s22s22p63523p645230104p5 is bromine
HELP PLZ!!! A sample contains only the compound CaCl2 and water. When it is dried, its weight decreases from 5.00g to 4.24g. What is the mass percentage of water in the original sample? Round to three significant figures.
Answer:is 15.2%
Explanation:
Got it wrong and this the correct answer it told me
The percentage of water in the original sample is 15.2 %.
From the information provided in the question;
Weight of the wet sample = 5.00g
Weight of the dried sample = 4.24g
Loss in mass = 5.00g - 4.24g = 0.76 g
percentage of water in the original sample = Difference in mass between wet and dry sample/ mass of wet sample × 100/1
Hence, when we substitute values;
percentage of water in the original sample = 0.76 g/5.00g × 100/1
percentage of water in the original sample = 15.2 %
So, the percentage of water in the original sample is 15.2 %.
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How many O atoms are there in 1.51×10^23 molecules of trifluoroacetic acid, C2HF3O2?
Answer:
9.033 × 10²³ molec C₂HF₃O₂ x (2 O atoms / 1 molec C₂HF₃O₂) = 1.8066 x 10²⁴ O atoms
There are 3.01 × 10^23 atoms of oxygen in 1.51×10^23 molecules of trifluoroacetic acid, C2HF3O2.
The formula of trifluoroacetic acid is C2HF3O2
Number of moles of the trifluoroacetic acid(C2HF3O2)is given using the approach;
1 mole of the compound contains 6.02 × 10^23 molecules
x moles of the compound contains 1.51 × 10^23 molecules
x = 1.51 × 10^23 molecules × 1 mole /6.02 × 10^23 molecules
x = 0.25 moles of trifluoroacetic acid.
Now;
Number of O atoms in the sample = 0.25 × 2 × NA
Where; NA = Avogadro's number
Number of O atoms in the sample = 0.25 × 2 × 6.02 × 10^23 atoms
= 3.01 × 10^23 atoms
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Write the name for each of the following chemical formulas.
d. P3N5 (for doping semiconductors)
Answer:
Triphorphorus Pentanitride
Explanation:
since there are three phosphorus use the prefix tri-, since there are five nitrogen use the prefix penta. tri=3, penta=5. then add a suffix -ide to the end of nitrogen. that will give you triphosphorus pentanitride.
What do scientists do to determine if their results support their hypothesis?
Answer:
They experiment, and study
Explanation:
Repeat your experiments several times to make sure that the first results weren't just an accident.
the # molecules in 52.1 grams of NH4OH
Answer:
Explanation:
Hey there!
From question;
The molecular mass of NH₄OH is 35.
Avogadro number = 6.023*10²³ molecules.
Then,
From mole concept,
Molecular mass = Avogadro number
So, 35 grams contains 6.023*10²³ molecules.
1 gram contains [tex]\frac{ 6.023*10^{23} }{35}[/tex] molecules.
52.1 grams contains [tex]\frac{6.023*10^{23} }{35} *52.1[/tex] molecules.
Therefore, 52.1 grams contains 8.96*10²³ molecules.
Hope it helps!
Elements Q and T are widely separated on the electronegativity scale. This indicates that in the compound QT Select one: Q And T are widely separated in atomic number Or the bond is principally ionic in character. Or the heat of formation has a low value. Or the bond is principally covalent in character.
This indicates that in the compound QT the bond is principally ionic in character. It is a fundamental type of chemical bond.
What is an ionic bond?An ionic bond is a type of chemical bond between two atoms due to the attraction between two opposite ions.
These opposite ions in an ionic bonding are referred to as negative ions and positive ions.
An ionic bonding only occurs when the electrons (e-) of a given atom can be transferred to other atoms in the compound.
Learn more about ionic bonds here:
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If 3.49 g of silver chloride, AgCl, is produced from the reaction of 5.95 g AgNO3 with excess BaCl2,
what is the percentage yield ?
(molar masses: AgCl = 143.4 g/mol, AgNO3 = 169.9 g/mol)
2 AgNO3(aq) + BaCl2(aq) + 2 AgCl(s) + Ba(NO3)2(aq)
Answer:
that not of i grade sorry
Explanation:
write the property of graphite? any two
Answer:
Allotrope of carbon.
High melting point.
Explanation:
Answer:
Density lower than that of diamond.
It has soft, slippery feel.
how does temperature affect solubility
Answer:
The increase in kinetic energy that comes with higher temperatures allows the solvent molecules to more effectively break apart the solute molecules that are held together by intermolecular attractions.
Explanation:
Solubility is affected by temperature due to heatness.
What are the basis of making symbols of an element?
Each element is given its own chemical symbol, like H for hydrogen or O for oxygen. Chemical symbols are usually one or two letters long. Every chemical symbol starts with a capital letter, with the second letter written in lower case. For example, Mg is the correct symbol for magnesium, but mg, mG and MG are wrong...
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if Tim and maliyah went to the moon and the moon is smaller than earth both maliyah and Tim's mass would stay the same and their weight would change
Answer:
no
Explanation:
Weight is a measure of how much gravity pulls on a mass or object. On the moon, there is less gravity pulling on objects, so they weigh less. ... But does its mass changejust because it is on the moon? No, it is still the same size and looks the same, it just has less gravity pulling on it, so it weighs less.
Determine the subunit composition of a protein from the following information:
a. Molecular mass by gel filtration: 200 kD
b. Molecular mass by SDS-PAGE: 100 kD
c. Molecular mass by SDS-PAGE with 2-mercaptoethanol: 40 kD and 60 kD
Answer:
Explanation:
The protein comprises of two 60-kD polypeptides and two 40-kD polypeptides. Each one of the 40-kD chains has a disulfide-bond which is directly bonded to a 60-kD chain.
The 100-kD units attach noncovalently to produce a protein with a molecular mass of 200 kD. The interaction among the different subunits in the protein is not affected by the Gel filtration chromatography.
Hence, the protein seems to be 200 kD in size. When SDS-PAGE takes place samples are being subjected to heat and therefore undergoing denaturation conditions. The aftermath effect of this causes disorganization in the 100 kD units.
However, the reducing agent (BME) main task is the reduction of disulfide bonds in a protein.
It implies that BME is responsible for the reduction between the R1-S-S-R2 bond between 40 kD and 60 kD to R1-SH and R2-SH, resulting in seperate proteins.
This is the chemical formula for acetic acid (the chemical that gives the sharp taste to vinegar):
CH. CO,H
An analytical chemist has determined by measurements that there are 4.2 moles of carbon in a sample of acetic acid. How many moles of hydrogen are in the
sample?
Be sure your answer has the correct number of significant digits.
Answer:
2.408 moles of hydrogen are in the sample.
Explanation:
Molecular formula of acetic acid =CH3COOH
Ratio of carbon to hydrogen :2/4:1/2
Measured number of moles of carbon atoms = 1.204
Let the moles of hydrogen be = x
Number of carbon atoms in 1.204 mol = 1.204mol*Avogadro number
Number of hydrogen atoms in x mol = x*Avogadro number
As we know that ratio of carbon to hydrogen atoms is 1:2.
1/2=1.204mol* avogadro/ x* avogadro
x = 2.408 moles
2.408 moles of hydrogen are in the sample.
Mg + AgNO3 MgNO3 + Ag
How many grams of magnesium are needed to produce 5.0 moles of silver
Answer:
539.35 g
Explanation:
molar mass of Mg = moles of Ag * molar mass of Ag
x = 5 * 107.87
x = 539.35 g