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At 1 atmospheric pressure, 1.000 g of w...

At 1 atmospheric pressure, 1.000 g of water having a volume of `1.000 cm^3` becomes 1671 `cm^3` of steam when boiled. The heat of vaporization of water at 1 atmosphere is `539 cal//g` . What is the change in internal energy during the process ?

A

540 cal

B

500 cal

C

1681 cal

D

none of these.

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