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Difference between Internal Energy and Enthalpy

The heat of c...

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The heat of combustion of CH_4(g), C(s) and H_2(g) at 25^{0 }C are -212.4 Kcal, -94.0 Kcal and -68.4 Kcal respectively, the heat of formation of CH_4 will be (1) +54.4 Kcal (2) -18.4 Kcal (3) -375.2 Kcal (4) +212.8 Kcal

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