Mass relationships in chemical reaction.
For the combustion of methane, beginning with 3.15 mole of CH4.
How many moles of O2 are required to completely consume the CH4?
The balanced chemical equation for the combustion of methane is:
CH4 + 2O2 -> CO2 + 2H2O
From the equation, we can see that each mole of CH4 reacts with 2 moles of O2. Therefore, the number of moles of O2 required to completely consume 3.15 moles of CH4 would be:
3.15 mol CH4 x (2 mol O2/1 mol CH4) = 6.3 mol O2
So, 6.3 moles of O2 are required to completely consume 3.15 moles of CH4 in the combustion reaction.