Question Detail

CHM 101 Chemical Thermodynamics Objective Question
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Question

Is the decomposition of liquid water at room temperature into H₂(g) and O₂(g) spontaneous?
Options
A Yes, because it increases entropy
B Yes, because it is endothermic
C No, the reaction is spontaneous in the reverse direction; water is very stable and decomposition requires electrical energy
Correct Answer
D It is at equilibrium
Correct Answer

Option C is the correct answer.

Detailed Explanation

The reaction is spontaneous in the reverse direction. Liquid water is very stable; decomposition requires electrical energy (electrolysis). It is highly endothermic, and ΔG > 0 at room temperature. The reverse reaction (formation of water from H₂ and O₂) is spontaneous and strongly exothermic.

Hint

The notes provide this reasoning.

Question Info

Course: CHM 101
Topic: Chemical Thermodynamics
Type: Objective
Difficulty: Not specified
Question 972 of 1872
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