`10 mL` of a mixture of `CO,CH_(4)`, and `N_(2)` exploded with excess of oxygen gave a contraction of `6.5 mL`. There was a further contraction of `7 mL`, when the residual gas treated with `KOH`. What is the composition of the original mixture?

Answer

5

Explanation

Let vol of `CO =x` ml, vol of `CH_(4) =y ml`
`CO+(1)/(2)O_(2) rarr CO_(2), CH_(4)+2O_(2) rarr CO_(2) +@H_(2)O`
contraction in vol `=(x)/(2) +2y = 6.5ml`
`rArr x +4y = 13 ml` .........(1)
contraction is vol when passed through `KOH`
`x +y = 7` .......(1), soliving (1) & (2)
`3y = 6, y = 2ml, x = 5ml` vol of `CO = 5ml`