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Question
What volume of oxygen at STP is required to affect the combustion of 11 litres of ethylene [C2H4] at 273°C and 380 mm of Hg pressure?
\[\ce{C2H4 + 3O2 → 2CO2 + 2H2O}\]
Solution
\[\ce{C2H4 + 3O2 → 2CO2 + 2H2O}\]
1V 3V
11litre 33 litre
P1 = 380 mm
P2 = 760 mm
V1 = 33 litres
V2 = ?
T1 = 237 + 276 = 549°K
T2 = 273°K
`("P"_1"V"_1)/("T"_1) = ("P"_2"V"_2)/("T"_2)`
`"V"_2 = ("P"_1"V"_1 "T"_2)/("P"_2 "T"_1) = (380 xx 33 xx 273)/(760 xx 546)` = 8.25 litres
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