Choose the correct statements concerning entropy.
I.Following the mixing of two gases,ΔS is positive.
II.Entropy is a thermodynamic property related to the degree of disorder.
III.If the temperature of a gas is decreased,ΔS is positive.
IV.Molecules in the liquid state have higher entropy than the same 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 correct because the mixing of two gases leads to an increase in the number of microstates available to the system, resulting in an increase in entropy. Statement II is correct because entropy is a measure of the number of ways a system can distribute its energy among its available microstates, and this is related to the degree of disorder. Statement III is incorrect because when the temperature of a gas decreases, the molecules lose kinetic energy and the degree of disorder decreases, resulting in a decrease in entropy. Statement IV is incorrect because molecules in the gaseous state have higher entropy than the same molecules in the liquid state since they have more translational degrees of freedom. Therefore, the best choice is C, which includes the correct statements I and II.

Choose the Correct Statements Concerning Entropy