Can enthalpy of combustion be positive?
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Answer: When a substance undergoes combustion it releases energy. Combustion is always exothermic, the enthalpy change for the reaction is negative, ΔH has a negative sign. ... So, by convention, the molar heat of combustion (molar enthalpy of combustion) is given in tables as a positive value.
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Answer:
no it is always negative
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