There are certain laws which need to be kept in mind while dealing with thermochemical equations. They are as follows:
l Enthalpy change is directly proportional to the quantity of a substance that reacts or is produced by a reaction and enthalpy is directly proportional to mass. On doubling the coefficients, the value of ΔH is also multiplied by two.
l Enthalpy change for a reaction is equal in magnitude but opposite in sign to that for the reverse reaction.
l Enthalpy change is independent of the number of steps involved. This rule is given the name - Hess's Law and is stated as “enthalpy change for a reaction is the same whether it occurs in one step or in a series of steps thus it is a state property and thus independent of the path of a reaction.
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