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Question

Volume of oxygen required for complete combustion of 12.5 dm3 of benzene at NTP is:

A
87.5 dm3
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B
43.75 dm3
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C
40 dm3
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D
80 dm3
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Solution

The correct option is A 87.5 dm3
The chemical reaction can be represented as:

C6H6+7.5O26CO2+3H2O

Since at NTP, 1 mole=22.4 litres, hence

According to the reaction, 22.4 L benzene requires 7.5×22.4=168 L oxygen for complete combustion

Therefore, 12.5 dm3 benzene will require 16822.4×12.5=87.5 dm3 oxygen for complete combustion

Hence, option A is the correct answer.

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