How to calculate the heat added during an isothermal process

[renlok]

Homework Statement

The title

Homework Equations

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The Attempt at a Solution

The only ways I know of to calculate heat are dQ = Cp.dT and dQ = Cv.dT for isochoric and isobaric process how would you go about doing it for an isothermal process

Also if a system isn't a cycle but it ends up in the same state it started is its change in internal energy still 0

 

[p21bass]

For an isothermal process with an ideal gas, the heat added (or subtracted - depending upon exactly what happens to the gas) is equivalent to the work done on (or by) the gas.