The equation `4NH_3 + 5O_2 rarr 4NO + 6H_2O`, represents the catalytic oxidation of ammonia. If 100 `cm^3` of ammonia is used, calculate the volume of oxygen required to oxidise the ammonia completely.

Explanation

`4NH_3 + 5O_2 rarr 4NO + 6H_2O`
Given: Ammonia used in the reaction = 100 `cm^3`
From the equation, 4 vol. of `NH_3` requires 5 vol. of `O_2` for its oxidation.
`:.` 1 vol. will require = `5/4`
Thus 100 `cm^3` of ammonia will require
`=5/4 xx 100`
= 125 `cm^3` of oxygen