Question: A pistoncylinder device contains an ideal-gas mixture of 3 kmol of His gas and 7 kmol of Ar gas at 50C and 400 kPa. Now

A piston–cylinder device contains an ideal-gas mixture of 3 kmol of His gas and 7 kmol of Ar gas at 50°C and 400 kPa. Now the gas expands at constant pressure until its volume doubles. The amount of heat transfer to the gas mixture is
(a) 6.2 MJ
(b) 4.2 MJ
(c) 27 MJ
(d) 10 MJ
(e) 67 MJ

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