The latent heat of vaporisation of water is $2240\, J/gm$. If the work done in the process of expansion of $1 \,g$ is $168 \,J$, then increase in internal energy is ....... $J$
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(c) $\Delta Q = \Delta U + \Delta W$$ \Rightarrow \Delta U = \Delta Q - \Delta W = 2240 - 168 = 2072\;J$.
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