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Find the weight of air for complete combustion of...

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

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+1 vote

asked Jan 29, 2022 in Farm Machinery by Olivia (38.9k points)

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

This question was posed to me by my college director while I was bunking the class.

My query is from I.C. Engine Components topic in chapter Internal Combustion Engine of Farm Machinery

farm machinery
internal combustion engine
i.c. engine components

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1 Answer

+1 vote

answered Jan 30, 2022 by William (243k points)
selected Feb 1, 2022 by Olivia

Best answer

The correct choice is (c) 113.67 kg

For explanation I would say: 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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