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Two moles of an ideal monoatomic gas occupies a volume V at 27°C. The gas expands adiabatically to a volume 2V. Calculate (a) the final temperature of the gas and (b) change in its internal energy.
(1) (a) 195 K (b) –2.7 kJ
(2) (a) 189 K (b) –2.7 kJ
(3) (a) 195 K (b) 2.7 kJ
(4) (a) 189 K (b) 2.7 kJ

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Ans. (2)

In an adiabatic process

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