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?

\[\ce{C2H4 + 3O2 → 2CO2 + 2H2O}\]

Answer 1

\[\ce{C2H4 + 3O2 → 2CO2 + 2H2O}\]

1 vol. = 11 litres

3 vol. = 33 litre

P₁ = 380 mm           

P₂ = 760 mm

V₁ = 33 litres

V₂ = ?

T₁ = 273 + 273 = 546°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