Question

Air contains 20% oxygen by volume. Calculate the theoretical volume of air which will be required for burning $200m^3$ of acetylene gas completely. All volumes are measured under the same conditions of temperature and pressure

Answer 1

Thus, 500 m 3 oxygen is required for complete combustion of $200m^3$ of acetylene. 20 m 3 of oxygen is present in 100 m 3 of air.
$500m^3$ of oxygen will be present in $=\frac{100}{20}\times 500m^3$ of air
$=2500m^3$ of air