One mole of methane gas at STP is expanded P adiabatically against ...

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One mole of methane gas at STP is expanded
P adiabatically against a pressure of 0.375 atm

W until its volume is doubled. Thus, \( \left[\mathrm{C}_{\mathrm{v}}\left(\mathrm{CH}_{4}\right)=3 \mathrm{R}\right] \)
(1) Work done is \( -8.4 \mathrm{~L} \) atm
(2) \( \mathrm{W}=\Delta \mathrm{U} \)
(3) Temperature falls by \( 34 \mathrm{~K} \)
(4) \( \mathrm{W}\Delta \mathrm{U} \)
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