For the reaction, 2CO + O2 → 2CO2 ; ∆H= -560 kJ. Two moles of CO and one mole of O2 are taken in a container of volume 1 L. They completely form two moles of CO2 , the gases deviate appreciably from ideal behaviour. If the pressure in the vessel changes from 70 to 40 atm, find the magnitude (absolute value) of ∆ U at 500 K. (1 L atm = 0.1 kJ )