In a small pan of heat capacity `300J//.^(@)C` we pour 0.5 litre water and we put this panon a stove: heating it at a constant rate. The temperature of the water is plotted in figure (a) against time. There were no heat loses. Then we removed the water from pan and cooled the pan back to `0^(@)C`. We poured 0.7 kg alcohol and heat it at the same constant rate. The temperature time graph is plotted in figure (b). Density of water `=1` kg /lit., specific heat capacity of water `=4200J//Kg.^(@)C`,

Half of the alcohol evaporates in 22 min from `t=0`. What is the specific latent heat of vaporisation of alcohol?

Options

A. `4.24xx10^(5)J//kg`
B. `3.6xx10^(5)J//kg`
C. `3.84xx10^(5)J//kg`
D. None of these