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Question

# Liquid benzene (C6H6) burns in oxygen according to the following reaction:2C6H6(l)+15O2(g)⟶12CO2(g)+6H2O(g)How many litres of O2 at STP are needed for complete combination of 39 grams of liquid benzene?

A
11.2
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B
74
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C
84
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D
22.4
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Solution

## The correct option is C 84The balanced reaction is as follows:2C6H6+15O2⟶12CO2+6H2O2×78 g of C6H6 =15×22.4 litres of O2 at STP39 g of C6H6=15×22.4×392×78=84 litres of O2 at STPHence, 84 L of O2 is needed for complete combustion of 39 g of liquid benzene.

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