A real gas is subjected to an adiabatic process from (2 bar, \( 40 \mathrm{~L}, 300 \mathrm{~K} ...

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A real gas is subjected to an adiabatic process from (2 bar, \( 40 \mathrm{~L}, 300 \mathrm{~K} \) ) to (4 bar, \( 30 \mathrm{~L}, 300 \mathrm{~K} \) ) against a constant pressure of 4 bar. The enthalpy change for the process is
(a) zero
(b) \( 6000 \mathrm{~J} \)
(c) \( 8000 \mathrm{~J} \)
(d) \( 10,000 \mathrm{~J} \)
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