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Q.

A real gas is subjected to an adiabatic process from (2 bar, 40 L, 300 K) to (4 bar, 30 L, 300 K) against a constant pressure of 4 bar. The enthalpy change for the process is (1 bar - litre = 100 J):

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a

zero

b

10000 J

c

8000 J

d

6000 J

answer is C.

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Detailed Solution

q=0;ΔU=−4(30−40)=+40ΔH=ΔU+Δ(PV)=40+(120−80)=80L−barΔH=8000J

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A real gas is subjected to an adiabatic process from (2 bar, 40 L, 300 K) to (4 bar, 30 L, 300 K) against a constant pressure of 4 bar. The enthalpy change for the process is (1 bar - litre = 100 J):