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The initial state of a diatomic gas sample is given by P1, V1, n1, and T1.

The gas sample expands from volume V1 to Volume 2V1.

Calculate the entropy change of the gas in terms of the above initial variables and the gas constant R if:

a. The expansion takes place at constant presssure

b. The expansion is Isothermal

c. The expansion is adiabatic

d. The expansion takes place in a repitition of joules free expansion experiment.

I sort of have a but its only halfass so I guess I need help/pointers on any of the parts.

Thanks!