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A sample of 0.1 g of water at 100ºC and normal pressure (1.013 × 10 5 Nm – 2 ) requires 54 cal of heat energy to convert to stream at 100ºC. If the volume of the steam produced is 167.1 cc, the change in internal energy of the sample, is :

1. 104.3 J
2. 84.5 J
3. 42.2 J
4. 208.7 J

Correct answer: 208.7 J

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