A 10% rich mixture of heptane (C7H16) and air is trapped in the cylinder of an engine at a pressure of 1 bar and temperature of 400 K. This is compressed and ignited, and at a particular instant during the expansion stroke, when the volume is 20% of the trapped volume, the pressure is 27.06 bar. Assuming that the mixture is in chemical equilibrium and contains only CO2, CO, H2O, H2 and N2, find the temperature and molar fractions of the constituents.