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A sample of 0.1 g of water of 100^(@)C a...

A sample of `0.1 g` of water of `100^(@)C` and normal pressure `(1.013 xx 10^(5) N m^(-2))` requires 54 cal of heat energy to convert to steam at `100^(@)C`. If the volume of the steam produced is 167.1 cc, the change in internal energy of the sample is

A

42.2J

B

208.7J

C

104.3J

D

84.5J

Text Solution

Verified by Experts

The correct Answer is:
B
`triangleQ=W+triangleW rArr triangleU=triangleQ-W`
`W=P(V_(f)-V_(l))`
`W=1.013 xx 10^(5) xx (167)/(10^(4)) =16.9T`
`triangleU=54 xx 4.18-16.9`
`triangleU=208.7J`
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