Question

How much dioxygen is required for the complete combustion of a `2.5*g` methane gas?

Answer 1

Under `12*g` of dioxygen gas will be required for complete combustion.

Explanation:

You need (i) a stoichiometrically balanced equation:

`CH_4 + 2O_2 rarr CO_2 +2H_2O`

And (ii), the molar quantity of methane that undergoes combustion:

`(2.50*g)/(16.01*g*mol^-1)=0.156*mol`

Given the stoichiometry, `2xx0.156*molxx32.00*g*mol^-1=??g` dioxygen gas will combust.