[填空题]
When $ 5.30\times10^{ 4}J$ of heat is added to a gas enclosed in a cylinder fitted with a light frictionless piston maintained at atmospheric pressure, the volume is observed to increase from $1.9m^3$ to $4.1m^3$ Calculate
(a) the work done by the gas, $ \times10^{5 }J$
(b) the change in internal energy of the gas. $ \times10^{5 }J$
(c) Graph this process on a PV diagram.
