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1 g of water at 100^(@)C is completely c...

1 g of water at `100^(@)C` is completely converted into steam at `100^(@)C`. 1g of steam occupies a volume of 1650cc. (Neglect the volume of 1g of water at `100^(@)C`). At the pressure of `10^5N//m^2`, latent heat of steam is 540 cal/g (1 Calorie=4.2 joules). The increase in the internal energy in joules is

A

2310

B

2103

C

1650

D

2150

Text Solution

Verified by Experts

The correct Answer is:
B
Heat supplied to the system is
Q= 540 cal
Work done by the system is
`W=P_(0)(V_(2)-V_(1))`
The initial volume `V_(1)` is negligible, so
`:. W=10^(5) (1650xx10^(-6))=165 J`
`Q=DeltaU+W`
`DeltaU=Q-W`
`:. DeltaU=540xx4.2-165=2103 J`
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