Question

17.3 #1

Which of the following transformations represent an increase in the entropy of the system.

Choose all that apply

1 mol Xe (0.810 atm, 215K) ->1 mol Xe (0.810 atm, 430K)

33 g Hg (liquid, 239K) -> 33 g Hg (liquid, 625K)

5 mol H₂ (8.87 L, 214K) -> 5 mol H₂ (17.7 L, 214K)

33 g Hg (gas, 630K) -> 33 g Hg (liquid, 630K)

49 g Pb (liquid, 601.0K) -> 49 g Pb (solid, 601.0K)

Answer 1

Solution: Options A , B and C

Entropy is a measurement of disorder or randomness. Increase in temperature increases randomness. Increase in volume also increases randomness.

Thus, the transformations which tends to increase entropy are:

A) 1 mol Xe (0.810,atm, 215 K) = 1 mol Xe(0.810 atm, 430 K)

B) 33 g Hg (liquid,239K) = 33 g Hg (liquid, 625 K)

C) 5 mol H2(8.87 L, 214K) = 5 mol H2 (17.7 L, 214 K)

Options D and E are tends to decrease entropy because conversion of gas into liquid and liquid into solid decreases randomness, hence it tend to decrease entropy.