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Find the weight of air for complete combustion of 10 litres of petrol assuming air contains 22.7% oxygen.

a) 106.10 kg
b) 120kg
c) 113.67 kg
d) 115.79 kg

Answer: c
Explanation: 2C6H14+19O2 – – 12CO2+12H2O
Density of petrol = 0.77 g/cc
Mass = 10*1000*0.73
7300 g petrol = 19*32*7300/2*86
= 25.80 kg
Amount of air required = 25.80*100/22.7
= 113.67 kg.

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