Question Detail

CHM 101 Thermochemistry II Objective Question

Question

If 2H₂(g) + O₂(g) → 2H₂O(l) has ΔH = -572 kJ, what is ΔH for the reverse reaction 2H₂O(l) → 2H₂(g) + O₂(g)?
Options
A -572 kJ
B +572 kJ
Correct Answer
C -286 kJ
D +286 kJ
Correct Answer

Option B is the correct answer.

Detailed Explanation

The reverse reaction has the opposite sign, so ΔH = +572 kJ.

Hint

The notes provide this calculation.

Question Info