1. Petrol (gasoline) is a mixture of hydrocarbons, one of which is octane, CH

(a) Describe briefly how petrol is obtained from petroleum. [2]

(b) Octane burns in air.

2C g H 1| + 25O_{2} -> 16C*O_{z} + 18H_{2}*O A petrol-powered motor car travels at a constant speed of 80 km/h. For every kilometre travelled 108 g of carbon dioxide are formed. When the motor car travels 100 km calculate

(i) the mass of carbon dioxide emitted by the car. [1]

(ii) the mass of petrol burned by the car assuming that petrol is 100% octane. [4]