A polytropic process ( n = 1.4 ) occurs in a piston cylinder assembly that initi

Question

A polytropic process (n = 1.4) occurs in a piston cylinder assembly that initially has an absolute pressure of 2,118 kPa.  The gas does work on the piston such that the volume increases from 0.09 m3 to 0.64 m3 .  What is the work done by the gas on the piston in kJ?

AND

A constant volume process occurs in a closed container that has a volume of 4 m3.  Heat is added to the container such that the absolute pressure increases 120 kPa to 207 kPa.  What is the work done by gas on the container in kJ?

AND

A constant pressure process occurs in a piston cylinder assembly that initially has an absolute pressure of 256 kPa.  Heat is added to the assembly such that the volume increases from 1.3 m3 to 4.8 m3 .  What is the work done by gas on the container in kJ?

I cant imagine these problems being to much work. However I am really stuck on where to even start. Please help and I will award you all the points.... This is important. I will only award all points if all three are answered

Explanation / Answer

for first question use pv -1 u will get the work

for second use del U =del Q +del W

same for thrd question also del U =del Q +del W

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