$3.)$ Air contained in a variable$-$load piston$-$cylinder with an electric heating element is initially at $200$ kPa and

$50C.$ The heating element is externally powered and turned on for a short duration until $150k\frac{J}{k}g$ of

electrical work has been done on the system. During this process heat losses to the surroundings occur

and the internal volume expands by $55\%.$ Determine how much heat per unit mass $(k\frac{J}{k}g)$ is lost to the

surroundings if the air temperature is held constant during this process?