Please Help. Physics

$4\mathrm{.}0$ g of nitrogen gas at $20$C and an initial pressure of $3\mathrm{.}2$ atm undergo a constant$-$pressure expansion until the volume has tripled.

Questions:

A$)$ What is the gas volume after the expansion?

B$)$ What is the gas temperature after the expansion?

C$)$ How much heat is transferred to the gas to cause this expansion?

The gas pressure is then decreased at constant volume until the original temperature is reached.

D$)$ What is the gas pressure after the decrease?

E$)$ How much heat is transferred from the gas as its pressure decreases?