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How many litres of oxygen (at STP) are r...

How many litres of oxygen (at STP) are required for complete combustion of 39 g of liquid benzene? (Atomic weights:C=12,0=16,H=1)

A

84

B

22.4

C

42

D

11.2

Text Solution

Verified by Experts

The correct Answer is:
A
The following reaction shows thye complete combustion of liqiued benzene.
`C_(6)H_(6)+7 1//2O_(2)to6CO_(2)+3H_(2)O`
(78)`(7.5xx22.4L)`
molar mass
The volume of `O_(2)` required for 78g of `C_(6)H_(6)`
`=7.5xx22.4L`
Therefor, volume of `O_(2)` reqiured for 39g of `C_(6)H_(6)`
` (7.5xx22.4xx39)/(78)=84L`
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