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I believe that delta H subscript c is the Standard enthalpy change of combustion or the change in enthalpy per mole of a substance that is burned in a combustion reaction under standard conditions. I dont know about the subscript h. I found this on page 291 of the textbook.
h is used in chemistry to symbolize enthalpy so I do not think you can have a delta H with a subscript of h because delta H is the change in enthalpy so h can not be enthalpy as well. Delta H can have subscripts of final, initial, products, reactants, vapor, fusion, sublimation, solid, liquid, etc.
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