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A piston-cylinder device contains a liquid-vapor mixture of water at 300 K. During a constant- pressure process, 750 kJ of heat is transferred to the water. As a result, part of the liquid in the cylinder vaporizes. What is entropy change of the water during this process?
  • a)
    -1.5 kJ/K
  • b)
    1.5kJ/K
  • c)
    2.5 kJ/K
  • d)
    - 2 .5 k J/K .
Correct answer is option 'C'. Can you explain this answer?
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A piston-cylinder device contains a liquid-vapor mixture of water at 3...
The system undergoes an internally reversible, isothermal process, and thus its entropy change, 
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A piston-cylinder device contains a liquid-vapor mixture of water at 3...
Entropy Change in a Constant-Pressure Process

Given:
- Temperature of the water, T = 300 K
- Heat transferred to the water, Q = 750 kJ

To find:
- Entropy change of the water, ΔS

The entropy change of a substance can be calculated using the equation:

ΔS = Q / T

where ΔS is the entropy change, Q is the heat transferred, and T is the temperature.

Calculations:
Given that Q = 750 kJ and T = 300 K, we can substitute these values into the equation to find the entropy change:

ΔS = 750 kJ / 300 K

Simplifying the equation:

ΔS = 2.5 kJ/K

Therefore, the entropy change of the water during this process is 2.5 kJ/K.
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A piston-cylinder device contains a liquid-vapor mixture of water at 300 K. During a constant- pressure process, 750 kJ of heat is transferred to the water. As a result, part of the liquid in the cylinder vaporizes. What is entropy change of the water during this process?a)-1.5 kJ/Kb)1.5kJ/Kc)2.5 kJ/Kd)- 2 .5 k J/K .Correct answer is option 'C'. Can you explain this answer?
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A piston-cylinder device contains a liquid-vapor mixture of water at 300 K. During a constant- pressure process, 750 kJ of heat is transferred to the water. As a result, part of the liquid in the cylinder vaporizes. What is entropy change of the water during this process?a)-1.5 kJ/Kb)1.5kJ/Kc)2.5 kJ/Kd)- 2 .5 k J/K .Correct answer is option 'C'. Can you explain this answer? for Mechanical Engineering 2025 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about A piston-cylinder device contains a liquid-vapor mixture of water at 300 K. During a constant- pressure process, 750 kJ of heat is transferred to the water. As a result, part of the liquid in the cylinder vaporizes. What is entropy change of the water during this process?a)-1.5 kJ/Kb)1.5kJ/Kc)2.5 kJ/Kd)- 2 .5 k J/K .Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A piston-cylinder device contains a liquid-vapor mixture of water at 300 K. During a constant- pressure process, 750 kJ of heat is transferred to the water. As a result, part of the liquid in the cylinder vaporizes. What is entropy change of the water during this process?a)-1.5 kJ/Kb)1.5kJ/Kc)2.5 kJ/Kd)- 2 .5 k J/K .Correct answer is option 'C'. Can you explain this answer?.
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