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When 1 gm of water changes from liquid t...

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

`2099 J`

B

`3000 J`

C

`992 j`

D

`2122 j`

Text Solution

Verified by Experts

The correct Answer is:
A
`W=P(dV) = 0.01xx10^(5)(1671-1)xx10^(-6)=167J`
`Q = DeltaU+W`
or, `Delta U = Q-W = mL-167 = 540 xx 4.2 -167`
`=2099J`.
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Knowledge Check

  • One mole of water at 100^@ C is converted into steam at 100^@ C at a constant pressure of 1 atm. The change in entropy is ____________. (heat of vaporization of water at 100^@ C=540 cal/g)

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