Question

A 20.0 cm³ mixture of CO, CH₄ and He gases is exploded by an electric discharge at room temperature with excess of oxygen. The volume contraction is found to be 13.0 cm³. A further contraction of 14.0 cm³ occurs when the residual gas is treated with KOH solution. Find out the composition of the gaseous mixture in terms of volume , percentage.

Answer 1

Let 'x' is the volume of CO and y is the volume of CH₄ and Z is the volume of He.

Given, x + y + z  =20    .....(i)

Thus,  1/2 x + y = 13     .....(ii)

x + y = 14    .......(iii)

x = 10cc and y = 4cc

Thus % CH₄ = 20, % CO = 50,% He = 30