EXAMPLE $8\mathrm{.}3-2$ Cooling of an Ideal Gas

Assuming ideal gas behavior, calculate the heat that must be transferred in each of the following cases.

A stream of nitrogen flowing at a rate of $100mo\frac{l}{m}in$ is heated from $20C$ to $100C.$

Nitrogen contained in a $5-$liter flask at an initial pressure of $3$ bar is cooled from $90C$ to $30C.$