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  4. In order to decompose 9 g of water 142.5 kJ of heat is required. Hence enthalpy of formation of water is

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Q. In order to decompose 9 g of water 142.5 kJ of heat is required. Hence enthalpy of formation of water is

Thermodynamics

Solution:

Heat required to decompose 1 mol (18 g) of $H_2O$
= $2 \times 142.5$ = 285 kJ
$\Delta H_f$ is the reverse of heat required
= 285 kJ $mol^{-1}$