Question

CH4 + 2O2 -> CO2 + 2H2O + heat If 5 mole of methane (CH4) react, how many mole of oxygen (O2) will be consumed?

Answer 1

`O_2 = 10` moles

Explanation:

FIRST we make sure that the equation is balanced. Then we compare the coefficients of the compounds to find the molar ratios of reaction.
`CH_4 + 2O_2 -> CO_2 + 2H_2O` is already balanced, so we only need to look at the ratio of methane and oxygen.
`CH_4 : O_2 = 1:2` or `O_2 = 2xxCH_4`

So, for 5 moles of methane we obtain:
`O_2 = 2xx5 = 10` moles