What does Hess law states ?

 What does Hess law states ?
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 Hess law states that the heat of reaction is same whether the reaction takes place in one or several states. Therefore Q=Q1+Q2+Q3+… Hess law is useful to calculate. Heat of reactions Lattice energy of ionic solids can be calculated by using. Hess law- Q = S+1/2 D +I.E-Ea-U   
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