Good grief Charlie Brown... This is a home work assignment my 16 year old daughter brought home from high school, she is a Junior.
I admit this is way beyond any help I can give her.
Anybody care to explain this?

Select a vehicle that can use all three grades of gasoline - unleaded, E-10 and E-85. Compare the carbonic acid that would be produced in the
atmosphere using unleaded gasoline, E-10 and E-85 driving from point A to point B a distance of 90 miles one-way.

hmm, well you have to choose a car then estimate the mileage or make an assumption of steady state cruising for each fuel and then convert that to MOLs? Plug in the numbers for each fuel's chemical composition to the left hand of the equation and balance it out to equalize the proportion and solve the CO2...H2O...and obviously the H2CO3 content.

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1974 240D 3.0L 4(M) - 250K -OM617.910 + 300D FW + Rajay turbo power!
1977 6.9 3(A) - 84k

I took chem sophomore year (last year), had a 104 average for most of the year.. Forgot a bit by now.. Is this assuming that all H, C and O in the exhaust forms carbonic acid, or only a certain percentage? Also have to find the chemical composition of gasoline, since its a blend of many different hydrocarbons, unless your assuming its 100% octane. Pick a car and find MPG, calculate how many gallons are required to drive 90 miles, then convert that volume to moles of each fuel (first multiplying .85*gallons, .15*gallons to find amount of ethanol and gaslone in E85 for example). Then solve for mols of H2CO3 that would be formed from that many mols of gas + ethanol + oxygen.

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Ich liebe meine Autos!

1991 Mercedes-Benz 560SEL | Megasquirt MS3-Pro | 722.6 transmission w/ AMG paddles | Feind Motorsports Sway Bar | Stinger VIP Radar | AntiLaser Priority | PLX Wideband O2 | 150A Alternator | Cat Delete
1981 Mercedes-Benz 300SD | Blown engine, rebuilding someday...
1981 Mercedes-Benz 300SD | Rear ended, retired in garage.
2009 Yamaha AR230HO | Das Boot

Excessive speeding? It ain't excessive till I redline!

Don't know if it helps any but my 2003 Yukon is E85 capable and real-world mileage figures are about 17.5 mpg for RUG and 12.5 for E85. Don't know about E10 but you could probably interpolate the values.

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1983 M-B 240D-Gone too.
1976 M-B 300D-Departed.

"Good" is the worst enemy of "Great".

I'd just like to thank the 3 of you for helping out.
I'm still lost, but with your guidance she was able to work out the problem/assignment.

Thank you for your responses.