Current Attempt in Progress

Your answer is partially correct.

A rigid copper tank, initially containing $1\mathrm{.}5m^3$ of air at $295K,\frac{5}{B}ar,$ is connected by a valve to a large supply line carrying air at $295K,15$ bar. The valve is opened only as long as required to fill the tank with air to a pressure of $15$ bar. Finally, the air in the tank is at $320$ K $.$ The copper tank, which has a mass of $20$ kg $,$ is at the same temperature as the air in the tank, initially and finally.

The specific heat of the copper is $c=0\mathrm{.}385k\frac{J}{k}g*K.$

Assuming ideal gas behavior for the air, determine:

$($a$)$ the initial and final mass of air within the tank, each in kg $,$ and

$($b$)$ the heat transfer to the air and copper tank from the surroundings, in kJ$,$ ignoring kinetic and potential energy effects.

$m_1=$

$m_2=$

$Q_{cv}=$