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**1. So, an ideal gas is initially at 293K and 200kPa, and has a volume of .004m**

^{3}**It undergoes a quasi-static, isotheral expansion until its pressure is reduced to 100kPa**

What is the Work done by the gas

What is the Work done by the gas

**2.I know that for isothermal conditions W=nRTln(P**

_{f}/P_{i})**3. my first attempt was making n=1 and P**

i got W to be 1685w.

My first problem with this is that I don't actually know what n is, and i'm not even sure what P

My next step was to isntead of guessing n=1, make PV=nRt because I have P and V, but i'm not sure which P to use.

_{f}=200kPa and P_{i}=100kPai got W to be 1685w.

My first problem with this is that I don't actually know what n is, and i'm not even sure what P

_{i}and P_{f}are, can't find it in my lecture notes anywhere.My next step was to isntead of guessing n=1, make PV=nRt because I have P and V, but i'm not sure which P to use.

**I know this dosen't seem like a difficult problem, but i won't be getting the answers until next month, so any guidance will be appreciated**