Question Detail

CHM 101 CHM 101 Past Questions Objective Question
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Question

For the reaction 2H₂(g) + O₂(g) → 2H₂O(g) with ΔH = -484 kJ, which statement is true?
Options
A The products occupy a larger volume than the reactants.
B The enthalpy change would be the same if liquid water were produced.
C The reaction is endothermic.
D The enthalpy of the products is lower than the potential energy of the reactants.
Correct Answer
Correct Answer

Option D is the correct answer.

Detailed Explanation

ΔH is negative, so the products have lower enthalpy. Reactants: 3 moles gas; products: 2 moles gas, so products occupy a smaller volume. If H₂O(l) were produced, ΔH would be more negative. The reaction is exothermic.

Hint

Count the moles of gas on each side and consider the sign of ΔH.

Question Info

Course: CHM 101
Topic: CHM 101 Past Questions
Type: Objective
Difficulty: Not specified
Question 1344 of 1872
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