Rank the standard molar entropy of the following from lowest to highest.
1.H₂O(l)
2.H₂O(g)
3.H₂O₂(l)
4.H₂O₂(aq)

Question

Rank the standard molar entropy of the following from lowest to highest. 1.H₂O(l) 2.H₂O(g) 3.H₂O₂(l) 4.H₂O₂(aq) A) 4 < 1 < 3 < 2 B) 1 < 3 < 4 < 2 C) 3 < 1 < 4 < 2 D) 2 < 4 < 3 < 1 E) 1 < 3 < 2 < 4

Quizplus · Accepted Answer

Entropy increases with the phase change from solid to liquid to gas, and solutions (aqueous) typically have higher entropy than their pure liquid forms due to the increased disorder from solute-solvent interactions. Given the substances listed, the order from lowest to highest entropy should consider their physical states: solid (not explicitly listed but implied for comparison), liquid, aqueous, and gas. Thus, the correct ranking starts with the pure liquid (1), followed by the larger molecule in liquid form (3) due to increased complexity and potential for internal movement, then the aqueous solution (4) due to the mixing entropy, and finally the gas (2) which has the highest entropy due to the greatest dispersal of molecules.

Rank the Standard Molar Entropy of the Following from Lowest