What characterizes the specific heat of combustion of fuel: body or substance? Using the reference data given

What characterizes the specific heat of combustion of fuel: body or substance? Using the reference data given on the flyleaf of the textbook, determine which of the substances indicated there has the lowest specific heat of combustion, and which has the highest.

Specific heat of combustion characterizes the substance of which the body is composed.
Hydrogen has the highest specific heat of combustion, while gunpowder has the lowest.

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