GATE ME 2014 Set 1 — Question 51
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Thermodynamics → Laws & Properties → Pure Substances & Phase Change
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Question
1.5 kg of water is in saturated liquid state at 2 bar (, , ). Heat is added in a constant pressure process till the temperature of water reaches 400°C (, , ). The heat added (in kJ) in the process is _______
Correct answer
4155 to 4160
Solution
For a closed system undergoing a constant pressure process, the heat added () is equal to the change in enthalpy ():Given:
- Mass of water,
- Initial state (saturated liquid at 2 bar):
- Final state (at 2 bar, 400°C):
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