Question Detail

CHM 101 CHM 101 Past Questions Objective Question
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Question

For the combustion reaction of methane: CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(l) with ΔH = -890 kJ, which statement is true?
Options
A The products occupy a larger volume than the reactants.
B The enthalpy of the products is higher than that of the reactants.
C The reaction is endothermic.
D The products have lower enthalpy than the reactants.
Correct Answer
Correct Answer

Option D is the correct answer.

Detailed Explanation

ΔH is negative, indicating an exothermic reaction. The products have lower enthalpy (potential energy) than the reactants. Reactants: 3 moles gas; products: 1 mole gas + liquid water, so products occupy a smaller volume.

Hint

Consider the sign of ΔH and the number of gas moles.

Question Info

Course: CHM 101
Topic: CHM 101 Past Questions
Type: Objective
Difficulty: Not specified
Question 1368 of 1872
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