please solve the last part

Chlorine gas is to be heated from 120.0C to 190.0C. Heat Input for Closed Vessel X You will have to determine U^U^ in the course of the calculation. Carry sufficient significant figures throughout the calculation. Calculate the heat input required to raise the temperature of 21.0kmol of chlorine in a closed rigid vessel from 120.00C to 190.0C initially at 1atm. (Suggestion: Evaluate U^ directly from the result of the first calculation, so that you do not have to perform another integration). Heat input: MJ