begin mathsize 48px style capital delta H space equals space capital delta U space plus space left parenthesis n subscript 2 space minus space n subscript 1 right parenthesis space R T end style

ΔH= Enthalpy change ; ΔU = Internal Energy Change ; n1 , n2 = Gaseous reactant's and Product's Total Mole Number;






This online chemistry calculator may be used to calculate the heat of a reaction (a.k.a enthalpy change of the reaction) at constant volume in terms of internal energy change, temperature and the mole number of the gaseous reactants and the products. It is to be noted that n1 represents the total mole number of the reactants which are gaseous. Similarly n2 should be the total mole number of the gaseous reactants. In any case if products or reactants are not gaseous then the respective mole number would be zero. 

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