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Question

What volume of air at 1 atm and 273 K containing 21% of oxygen by volume is required to completely burn sulphur (S8) present in 200 g of sample, which contains 20% inert material which does not burn. Sulpur burns according to the reaction
18S8(s)+O2(g)SO2(g)

A
23.52 L
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B
320 L
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C
112 L
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D
533.33 L
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Solution

The correct option is D 533.33 L
Weight of S8 in sample=160 g
Moles of S8=16032×8=0.625
Number of moles of O2 required=0.625×8
Volume of O2 required at STP=22.4×5
Volume of air required at STP=22.4×5×10021=533.33 L

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