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Laplace law defines that when a reaction is done ,the enthalpy change remains same to the enthalpy change when done in the reverse direction but the change in ebthalpy have opposite signs.

H2 + 1/2 O2 ----> H2O ....dH=-285.1j

H2O -----> H2 + 1/2 O2 .....dH.... +285.1j

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