Engineering Thermodynamics
According to Dalton's law, the total pressure of the mixture of gases is equal to

Sum of the partial pressures of all
Average of the partial pressures of all
Sum of the partial pressures of all divided by average molecular weight
Greater of the partial pressures of all

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Engineering Thermodynamics
Work-done during adiabatic expansion is given by (where p1 v1, T1 = Pressure, volume and temperature for the initial condition of gas, p2, v2, T2 = Corresponding values for the final condition of gas, R = Gas constant, and γ = Ratio of specific heats)

[m R (T1 - T2)] /(γ - 1)
All of these
[m R T1/(γ - 1)][1 - (p2, v2 /p1 v1)]
(p1 v1 - p2, v2)/(γ - 1)

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Engineering Thermodynamics
The universal gas constant (or molar constant) of a gas is the product of

Molecular mass of the gas and the specific heat at constant pressure
Molecular mass of the gas and the specific heat at constant volume
Molecular mass of the gas and the gas constant
Atomic mass of the gas and the gas constant

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