Enthalpy of combustion of a substance is always?
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Answer:
EXOTHERMIC.
Explanation:
Combustion is always exothermic, the enthalpy change for the reaction is negative, ΔH has a negative sign. Molar Heat of Combustion (molar enthalpy of combustion) of a substance is the heat liberated when 1 mole of the substance undergoes complete combustion with oxygen at constant pressure.
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