One mole of a monoatomic ideal gas is initially at pressure Pi=6.0×105Pa and volume Vi=0.010m3. It expands reversibly and adiabatically to a final volume Vf=0.020m3. For a monoatomic gas, γ=35. Find the work done by the gas (in kJ).
a) 4.2kJ
b) −3.3kJ
c) 3.3kJ
d) 2.2kJ