A gas injection system supplies a mixture of propane (C3H8) and air to a spark-ignition engine, in the ratio of volumes of 1:30. The mixture is trapped at 1 bar and 300 K, the volumetric compression ratio is 12:1, and the index of compression, k = 1.4. Calculate the equivalence ratio, the maximum pressure and temperature achieved during the cycle, and also the composition (by volume) of the dry exhaust gas.