The latent heat of vapourisation of water at 25C is 10.5 kcal mol-1 and the standard heat of formation of liquid water is -68.3 kcal. The enthalpy change of the reaction

H2g+1/2O2gH2Og is therefore,

1. -57.8 kcal

2. -78.8 kcal

3. 78.8 kcal

4. -47.3 kcal

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Concept Questions :-

Enthalpy and It's Type
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