Fuels and Combustion
The heat of combustion of a fuel

Is always positive
Is always negative
Is equal to the heat of formation
Can't be known without calculating it

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Fuels and Combustion
Calorific value of

Light paraffinic fuel oils is lower than that of equivalent olefins
N-paraffin is lower than that of iso-paraffins of the same compounds
Light paraffinic fuel oils is higher than that of equivalent olefins
Light paraffinic fuel oils is equal to that of equivalent olefins

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