Choose the correct statements concerning entropy. I) As two gasses mix, ΔS is positive.
II) Entropy is a thermodynamic property related to the degree of disorder.
III) As temperature in a gas decreases, ΔS is positive.
IV) Molecules in the liquid state have higher entropy than molecules in the gaseous state.
A) I and III
B) I, II, III
C) I and II
D) I, II, IV
E) II and III

Question

Quizplus · Accepted Answer

Statement I is true, as the mixing of gases leads to an increase in randomness and thus an increase in entropy. Statement II is also true, as entropy is a measure of the disorder or randomness of a system. Statement III is false, as a decrease in temperature typically leads to a decrease in entropy. Statement IV is false, as molecules in the gaseous state have higher entropy than molecules in the liquid state due to increased randomness and freedom of motion. Therefore, only statements I and II are correct, and choice C is the best answer.

Choose the Correct Statements Concerning Entropy