When 1 gm of water changes from liquid to vapour phase at constant pressure of 1 atmosphre, the volume increases from 1cc to 1671cc. The heat of vaporisation at his pressure is 540 cal/gm. Increase in internal energy of water is (1 atmosphre =1.01x `10^(6)` dyne/`cm^(2)`)A. 4200JB. 8200JC. 1200JD. 2100J

When 1 gm of water changes from liquid to vapour phase at constant pre

1.	When 1 gm of water changes from liquid to vapour phase at constant pressure of 1 atmosphre, the volume increases from 1cc to 1671cc. The heat of vaporisation at his pressure is 540 cal/gm. Increase in internal energy of water is (1 atmosphre =1.01x `10^(6)` dyne/`cm^(2)`)A. 4200JB. 8200JC. 1200JD. 2100J
Answer» Correct Answer - D `dQ=mL,dW=P(V_(2)-V_(1)),dU=dQ-dW`

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