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

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Engineering Thermodynamics
Extensive property of a system is one whose value

Does not depend on the mass of the system, like temperature, pressure, etc.
Depends on the mass of the system like volume
Is dependent on the path followed and not on the state
Is not dependent on the path followed but on the state

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