A piston $-$ cylinder device initially contains $1m^3$ of air at $200$ kPa and $25C.$ Air expands at constant pressure while a heater of $250$ W is switched on for $10$ minutes. There is a heat loss of $4$ kJ during this process. Assuming air as an ideal gas, the final temperature of air is $q,C($rounded off to one decimal place$).$

Use the following data for air: $R=0\mathrm{.}287k\frac{J}{k}g=K_K{C}_p=1\mathrm{.}005k\frac{J}{k}g-K$