If a #25.6*g# mass of #"octane"# is completely combusted, what mass of carbon dioxide will result?
We need (i) a stoichiometrically balanced equation.....
Is this balanced with respect to mass and charge? It must be if we purport to represent chemical reality.
And (ii) we need equivalent quantities of octane.....
And given the equation, CLEARLY we KNOW that 8 equiv of carbon dioxide result per equiv of octane.....
And thus a molar quantity of
79 grams of carbondioxide
This is the chemical reaction.
1 mole of octane mass is 114 grams.
It means if you have 114 grams of octane, you will have 352 grams of
However you have only 25.6 grams of octane. You can get how much carbondioxide after the reaction.