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Because enthalpy is a state function and an extensive property.
Wiki User
∙ 10y ago
Hess's law allows you to calculate the enthalpy change of a reaction by using the enthalpy changes of other reactions. This is particularly useful when direct measurement of the desired reaction is not feasible.
Wiki User
∙ 8y agoThe reason Hess' Law can be used to calculate enthalpy change is based on the fact the ∆H is a state function, and thus is independent of the path taken.
Wiki User
∙ 10y agoSee the link below for details
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See the link below for details
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