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The entropy change associated with the conversion of 1 kg of ice at 273 K to water vapours at 383 K is : (Specific heat of water liquid and water vapour are 4.2 kJ K –1 kg –1 and 2.0 kJ K –1 kg –1 heat of liquid fusion and vapourisation of water are 334 kJ kg –1 and 2491 kJ kg –1 , respectively). (log 273 = 2.436, log 373 = 2.572, log 383 = 2.583)

1. 2.64 kJ kg –1 K –1
2. 9.26 kJ kg –1 K –1
3. 7.90 kJ kg –1 K –1
4. 8.49 kJ kg –1 K –1

Correct answer: 9.26 kJ kg –1 K –1

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