A petrol engine has a cylinder diameter of 90mm and a stroke of 100mm. The compression ratio is 8:1. At the start of the stroke, the cylinder is full of a petrol/air mixture at a pressure of 1 bar and a temperature of 25C. Compression takes place according to the law pV1.3 = c and the characteristic gas constant for the mixture is 286.7 J kg-1 K-1 .

Determine: a) The mass of gas in the cylinder.

b) The pressure at the end of the compression stroke.

c) The temperature at the end of the compression stroke.