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Question

An ideal gas is made to go through a cyclic thermodynamic process in four steps. The amount of heat involved are Q1=600 J, Q2=āˆ’400 J, Q3=āˆ’300 J and Q4=200 J respectively. The corresponding work involved are W1=300 J, W2=āˆ’200 J, W3=āˆ’150 J and W4.
What is value of W4?

A
50 J
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B
100 J
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C
150 J
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D
50 J
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Solution

The correct option is C 150 J
ΔQ=ΔU+ΔW
ΔU=0 (for cyclic process)
cycle Q=cycle W
600400300+200=300200150+W4
W4=150 J

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