An ideal gas is initially at a pressure of 0.1 MPa and a total volume of 2 m³. It is first compressed to 1 MPa by a reversible adiabatic process and then cooled at constant pressure to a final volume of 0.2 m³. The total work done (in kJ) on the gas for the entire process (up to one decimal place) is _______. Data: R = 8.314 J/mol.K; heat capacity at constant pressure (C_p) = 2.5R