2.56 | Irodov Solutions | Thermodynamics

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[bhavya]

2.57 : P = RT/V-b - a/V^2
w = integral P.dV
2.58 : same procedure as 2.57

[Hihello-pv]

In this qn, it is given that gas has to be heated to increase its temperature, so (alpha) is surely a positive constant, right ?
( as temperature in kelvin is always>0)