A sample consisting of 2.0 mol CO2 occupies a fixed volume of 15.0 dm3 at 300 K. When it is supplied with 2.35 kJ of energy as heat, its temperature increases to 341 K. Assuming that CO2 is described by the van der Waals equation of state, calculate the work done (w), the change in internal energy (ΔU), and the change in enthalpy (ΔH).