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Question

At 25ºC, the standard enthalpy of combustion of gaseous propane (C3H8) is -2219.0 kJ per mole of propane, and the standard enthalpy of combustion of gaseous propylene (C3H6) is -2058.3 kJ per mole of propylene. What is the standard enthalpy change for the following reaction at 25ºC?

SubstanceHºf(kJ/mol)
CO2(g)-393.5
H2O(l)-285.8

A) +104.7 kJ
B) -20.4 kJ
C) -125.1 kJ
D) +160.7 kJ
E) -160.7 kJ

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