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Its all about matching the coefficients of the reactants and how many moles of reactant are reactions say for the reaction 2A>3B and delta h is -20, if there were 4 moles of A reacting then we have to multiply delta h by two so that the coefficient matches the number of moles reacting
Enthalpy is a property which varies with the moles of reactants/products present, and oftentimes the units would be KJ/mole or would ask you to find it permole, so it makes sense to make stoichiometrically correct calculations when finding the enthalpy of the reaction.
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