Engineering Board Exam Reviewer · Thermodynamics · easy

The amount of heat required to change 1 kg of saturated liquid water at 100 °C into saturated vapor at 100 °C (1 atm) is approximately:

1. 2257 kJ
2. 334 kJ
3. 4.187 kJ
4. 419 kJ

Answer

A. 2257 kJ

Solution

The latent heat of vaporization of water at 101.325 kPa is h fg 2257 kJ/kg (970 BTU/lb).

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