Physics Answer the following in Brief

0.5 mole of gas at temperature \(450 K\) expands isothermally from an initial volume of \(3 L\) to final volume of \(9 L\).
(a) What is the work done by the gas? \(\left( R =8.319 J mol ^{-1} K ^{-1}\right)\)
(b) How much heat is supplied to the gas?

State zeroth law of thermodynamics. What are the limitations of first law of thermodynamics.