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Heat of vaporisation of water at 1 atm and 25°C is 10.52 kcal. The standard heat of formation (in kcal) of 1 mole

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Heat of vaporisation of water at 1 atm and 25°C is 10.52 kcal. The standard heat of formation (in kcal) of 1 mole of water vapour at 25°C is : 

(a) –57.80 kcal 

(b) +57.80 kcal 

(c) 78.84 kcal 

(d) –78.84 kcal

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Correct option (a) –57.80 kcal

Explanation:

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