In an engine cylinder a gas has a volumetric analysis of 12 % CO₂, 11.5% 0₂, and 76.5 % N₂. The temperature at the beginning of expansion is 1000°C and the gas misture expaints reversibly through a volume ratio of 7:1, according to the law PV¹.²⁵= C. Calculate per kg of "ys (i) the work done (ii) the heat flow. The values of Cp for the constituents CO₂, O₂ and N₂ sire 1.271kg, 1.110kg and J1.196kgK respectively.