The number of liters of air required to burn 8 litres of ethene is

Answer :100 L
HC≡CH(g)+52O2(g)→2CO2(g)+H2O(l)

Assume constant pressure, and constant temperature one volume of acetylene gas requires 5/2 volumes of dioxygen for complete combustion..........

And so, if there are 8L of acetylene, we requires a volume of 8 L×5/2=20Ldioxygen gas

The percentage of oxygen in air BY volume, is approx. 21%.

And thus we need a volume of
100 L air that contain approxinately 20 L oxygen

So approximately
100L required

Answer :100 L