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MCQ
For the reaction A + B -> C, delta H = +120 kJ. If the equation is doubled (2A + 2B -> 2C), the delta H becomes:
Unit-8 Energetics
A +60 kJ
B +120 kJ
C +240 kJ
D -120 kJ
Explanation

Enthalpy change is proportional to the amount of substance, so doubling the reaction doubles delta H to +240 kJ.

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