3. (30%) One kg of liquid n-octane (C8H18) is placed in a closed rigid container with 50% excess air at 100C and 1 bar. It undergoes an isothermal process in which it reacts and completely combusts to form CO2(g) and H2O(g). Assume an ideal gas. Take the heat capacity of liquid n-octane to be: cP= 250[molKJ].( Koretsky 2.34a,b) C8H18(l)+225O2(g)8CO2(g)+9H2O(g) a) What is the final system pressure? b) How much heat must be removed to keep the chamber at 100C