A gas mixture of 35% CO2, 20% CO, and 45% N2 by volume, at 300 K and 100 kPa, is compressed until the total volume decreases to 1/6 of its initial volume and 500K at the end of compression, Considering change of specific heats with temperature, determine (a)mass fraction of each component, (b) the change of the internal energy per unit mass of mixture, and (c) the change of the entropy per unit mass of mixture