The enthalpy of combustion of propane, graphite and dihydrogen at 298 K are: , and respectively. The magnitude of enthalpy of formation of propane () is . (Nearest integer)

Question

The enthalpy of combustion of propane, graphite and dihydrogen at 298 K are: ,  and  respectively. The magnitude of enthalpy of formation of propane () is  . (Nearest integer)

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Strategy:
 Use the standard combustion enthalpy cycle: .

Step 1: Calculate  for Propane ()

.
Magnitude rounded .

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