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  4. The heat of formation of H2O(l) is -286 kJ. The· heat of formation of H2O(g) is likely to be

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Q. The heat of formation of $H_2O_{(l)}$ is $-286\, kJ$. The· heat of formation of $ H_2O_{(g)}$ is likely to be

COMEDKCOMEDK 2012Thermodynamics

Solution:

The enthalpy of $H_2O_{(l)}$ is less than that of $H_2O_{(g)}$, hence more energy will be released when $H_2O_{(l)}$ is formed.
$\Rightarrow \Delta H_f H_2O_{(g)} < \Delta H_f H_2O_{(l)}$