What volume of oxygen at STP is required to affect the combustion of 1 litres of ethylene $[C_{2} H_{4}]$ at $273^{\circ} C$ and 380 mm of Hg pressure?
$C_{2} H_{4} + 3 O_{2} \to 2 C O_{2} + 2 H_{2} O$

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Solution

Let no. of mole of is n
pressure = $\frac{380}{760} a t m = \frac{1}{2} a t m$
T = 273+273 = 546K
V = 1 L
R = 0.0821
Apply
PV = nRT
= n0.0821546
n = mole
for one mole of combustion of , 3mole of is required
so for
0.0110 mole = 3 mole $O_{2}$ required
= 0.0332mole
volume of one mole gas at STP = 22.4L
volume of 0.0332 mole at STP = 22.4= 0.744L

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