Question

Explain Hess's law of constant heat summation ?​

Answer 1

HEY MATE !!!!!__________________

G.H.Hess proposed a law regarding the heats or enthalpies of reaction in 1840 called the Hess's law. This law states that 'the heat change in a particular reaction is the same whether it takes place in one step or several steps'.

For example, a reactant 'A' changes to a product 'B' in one step and the heat change during this process is DH. If the reaction is carried out in two steps where 'A' first changes to 'C' an intermediate stage and then 'C' changes to 'B' in the following step then let the heat change during the formation of 'A' to 'C' beDH1 and that from 'C' to 'B' be DH.

DH = DH1 + DH2

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Answer 2

HELLO !!☺☺☺

HESS'S LAW OF CONSTANT HEAT SUMMATION :

If a reaction takes place in several steps then it's standard reaction enthalpy is the sum of the standard enthalpies of the intermediate reaction into which the overall reaction may be divided at the same temperature .

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