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An ideal, 1-atom gas with a constant amount of substance expands slowly and reversibly from volume...

An ideal, 1-atom gas with a constant amount of substance expands slowly and reversibly from volume V1 to volume V2. At the same time, the pressure drops so that P (V) is a linear function of the volume.
The starting permit is given as: V1 = 22.0 liters, P1 = 399,000 Pa
The final state is given as: V2 = 32.0 liters, P2 = 299,000 Pa The amount of substance n = 1.00 mol
a) Determine the expression and values ​​of W, ∆U and Q for the gas in this process. The expressions should only contain given quantities and constants, ie P and V in start and end states, n and constants, but no temperatures.
b) Derive a formula for ∆S based on the basic definition. Also this formula should only contain P and V in start and end states, n and constants. Also determine the numerical value for ∆S.

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