Assuming gasoline is 100% isooctane, with a density of 0.692 g/mL, what mass of carbon dioxide is produced by the combustion of 1.2 x 1010 gal of gasoline?
I use a US gallon,
For each equiv of octane consumed, clearly 8 equiv carbon dioxide are produced.
So how many moles of octane?
So this is how many moles of octane? And clearly, from the stoichiometrically balanced equation, 8 mol carbon dioxide result from the combustion of 1 mole of octane. You are still not done in that you to multiply this number in moles by the molecular mass of carbon dioxide,
I make no guarantees of my formatting or of my arithmetic. This is the problem with using ridiculous units such as pounds or ounces or furlongs or gallons. I don't even know whether you are using a US gallon or an Imperial gallon,
PS I have to go to the bank this afternoon to get some readies (cash) for Xmas. Do you think I will get served if instead of asking for £100-00, I ask for 100 guineas?