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Evgesh-ka [11]
3 years ago
11

The entropy of a sample of CO2 increases as the CO2 changes from

Chemistry
2 answers:
andrew-mc [135]3 years ago
8 0
The answer is (4) solid to gas. The entropy is the measurement of disorder. The entropy of CO2 under different status will increase from solid to liquid to gas. So the answer is (4).
alex41 [277]3 years ago
5 0

Answer: Option (4) is the correct answer.

Explanation:

Entropy is defined as the degree of randomness. That is, when particles of an object or matter are rapidly moving from one place to another then it means that the object has high entropy.

For example, gases have high entropy than liquids and solids.

Whereas when particles of an object are closer to each other then it means that entropy of the object is low. For example, solids have low entropy.

Thus, we can conclude that the entropy of a sample of CO_{2} increases as the CO_{2} changes from solid to gas.

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A sample of strontium bicarbonate weighs 5.0020 mg. How many oxygen atoms are in the sample? I have the answer, but don't unders
hodyreva [135]

There are 14.4 * 10^18 oxygen atoms in 5.0020 mg of  strontium bicarbonate.

Mass of strontium bicarbonate Sr(HCO3)2 = 5.0020 mg

Molar mass of strontium bicarbonate Sr(HCO3)2 = 209.6537 g/mol

Number of moles of strontium bicarbonate Sr(HCO3)2 = 5.0020 * 10^-3g/209.6537 g/mol

= 2.3858 * 10^-5 moles

Given that we have 6 oxygen atoms per molecule of Sr(HCO3)2, the total number of oxygen atoms in Sr(HCO3)2 becomes;

2.3858 * 10^-5 moles * 6.02 * 10^23 = 14.4 * 10^18 oxygen atoms

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2 years ago
A chemist prepares a solution of sodium chloride(NaCl) by measuring out 25.4g of sodium chloride into a 100ml volumetric flask a
labwork [276]

Answer: 4 molL-1

Explanation:

Detailed solution is shown in the image attached. The number of moles of NaCl is first obtained. Since the molarity must be in units of molL-1, the volume is divided by 1000 and the formula stated in the solution is applied and the answer is given to one significant figure.

5 0
2 years ago
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Answer:

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Explanation:

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From Faraday's law of electrolysis,

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<u>∴ Valency of Mn = +4</u>

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3 years ago
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Explanation:

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