Laplace – Lavoiser Law of Thermo chemical Reaction

The amount of heat for the reverse of a reaction will be equal but will have opposite sign.

eg. C (s) + O2 (g)    →     CO2 (g)                   H = – 393 KJ


CO2 (g)         →        C (s) + O2 (g)                 H = + 393 KJ

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