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Question

When 5 litres of a gas mixture of methane and propane is perfectly combusted at 0C and 1 atmosphere, 16 litres of oxygen at the same temperature and pressure is consumed. The amount of heat released from this combustion in kJ(ΔHcomb.(CH4)=890 kJ mol1, ΔHcomb.(C3H8)=2220 kJ mol1) is

A
38
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B
317
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C
477
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D
32
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Solution

The correct option is B 317
CH4+202CO2+2H2O
C3H8+5023CO2+4H2O
CH4+C3H8=522.4=0.22 moles
O2=1622.4=0.71 moles
2x+(0.22x)5=0.71
x=0.13
Heat liberated=0.13×890+0.09×2220=316 kJ

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