AP Chemistrymediummcq1 pt
Given: 2H₂ + O₂ → 2H₂O, ΔH = −571.6 kJ. What is ΔH per mole of water formed?
A.−285.8 kJ
B.−571.6 kJ
C.−1143.2 kJ
D.+285.8 kJ
Explanation
Core Concept
The equation makes 2 mol of water, so per mole: −571.6 ÷ 2 = −285.8 kJ/mol — the standard enthalpy of formation of liquid water.
Correct Answer
A−285.8 kJ
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