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If the gas was not pure butane but 10 mole percent propane and 90 mole percent butane then determine how would the MW value be affected?

Using an ideal gas and its n moles are expanded adiabatically and reversibly from P1, V1, and T1 to a final state V2. It is given that the molar heat capacity at constant volume = 1.5, find an algebraic equation for P2 in terms of the other variables (including 'n').

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