- #1

- 1,384

- 0

## Homework Statement

Calculate the increase in internal energy of 1 kg of water at 100 degrees Celsius when it is converted into steam at the same temperature and at 1atm. The density of water and steam are 1000kg/m

^{3}and 0.6kg/m

^{3}resp. The latent heat of vaporisation of water is 2.25 x 10

^{6}J/kg

## The Attempt at a Solution

The heat given to convert 1 kg of water to steam is 2.25 x 10

^{6}J.

I don't understand whether work is done

**by**the system or

**on**the system in increasing its volume.

The work done (by or on) the system is given by

W=nRTln(V

_{2}/V

_{1}) as the temperature remains same.

On adding both the values I got a wrong answer.

The correct answer is 2.08 x 10

^{6}J.

Please explain.