First slide

Change in internal energy

Question

In the case of ice converted into water

Easy

A

there is no change in internal energy as temperature remains constant.
B

work is done by the system.
C

change in internal energy is less than 80 calories per gram
D

change in internal energy is more than 80 calories per gram.

Solution

In change of state latent heat is involved in changing the state. here work is done on the system by atmosphere
$dQ = du - dw du = dQ + dw > dQ$

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