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1 kg of water at 100°C is converted into steam at 100°C by boiling at atmospheric pressure. The volume of water changes from 1.00 × 10 –3 m 3 as a liquid to 1.671 m 3 as steam. The change in internal energy of the system during the process will be (Given latent heat of vaporisation = 2257 kJ/kg, Atmospheric pressure = 1 × 10 5 Pa)

1. –2426 kJ
2. +2090 kJ
3. –2090 kJ
4. +2476 kJ

Correct answer: +2090 kJ

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