The heat of combustion of a fuel___________________?
Correct answer: A. Is always negative
- A. Is always negative
- B. Is equal to the heat of formation
- C. Can't be known without calculating it
- D. Is always positive
Explanation
With the thermodynamic sign convention, combustion is exothermic, so its enthalpy change or heat of reaction is negative. The positive quantity often quoted in fuel specifications is the calorific value, which represents heat released.
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