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Q.

How many litres of oxygen (at STP) are required for complete combustion of 39 gms of liquid Benzene? (Atomic weights: C = 12, H = 1, O = 16 )

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a

84

b

22.4

c

42

d

11.2

answer is A.

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Detailed Solution

C6H6+2O2→6CO2+3H2O

2C6H6Mass+15O2Volume→12CO2+6H2O

2×78-15×22.4

39-----x

x=39×15×22.42×78

=84 L

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How many litres of oxygen (at STP) are required for complete combustion of 39 gms of liquid Benzene? (Atomic weights: C = 12, H = 1, O = 16 )