The increase in internal energy of \( 1 \mathrm{~kg} \) of water at \( 100^{\circ} \mathrm{C} \)...

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The increase in internal energy of \( 1 \mathrm{~kg} \) of water at \( 100^{\circ} \mathrm{C} \) when it is converted into steam at the same temperature and at \( 1 \mathrm{~atm}(100 \mathrm{k} \mathrm{Pa}) \) will be [The density of water and steam are \( 1000 \mathrm{~kg} / \mathrm{m}^{3} \& 0.6 \) \( \mathrm{kg} / \mathrm{m}^{3} \) respectively. The latent heat of vapourisation of water is \( \left.2.25 \times 10^{6} \mathrm{~J} / \mathrm{kg}.\right] \)
(A) \( 2.08 \times 10^{6} \mathrm{~J} \)
(B) \( 4 \times 10^{7} \mathrm{~J} \)
(C) \( 3.27 \times 10^{8} \mathrm{~J} \)
(D) \( 5 \times 10^{9} \mathrm{~J} \)
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