The latent heat of vapourisation of water is 2240 ~J . If the work done in the process of vapourisation of 1 ~g is 168 ~J , then increase in internal energy is

Step-by-step solution

Latent heat of vapourisation of water (L)=2240 ~J , mass of the water ( m )=1 ~g and work done (d W)=168 ~J From first law of thermodynamics, heat supplied in vapourisation (d Q)=mL=d U+d W or or aligned & 1 2240=d U+168 & d U=2240-168=2072 ~J aligned (where d U= increase in internal energy).