extra credit problem

[ineedchemhelp]

hey guys,

i need some help with an extra credit problem. This information is not in my textbook so I dont know how to approach it at all. Please help.. its worth 5 grade points.. and I really need those points. Here is the question.

What would be the effect on the concentration of atmosphereic CO2 in  year if 1 billion (1x10^9) cars each burned 1000 gal of gas during that year. ( note: there is a current concentration of atmospheric CO2. We want to figure out what the concentration would become after the billion cars ran for that year?
 
- assume that gasoline is octane (C8H18)
- assume that the earth is a smooth sphere with a radius of 4000.
- atmosphere pressure is 14.7 lbs/in2 , ( the weight of the atmosphere is 14.7 lbs on every square inch of the earth
- the area of a sphere = 4 * pie * (radius)^2
- 1 lb = 454 grams
- 1 gallon = 4 qts
- 1 qt= ~ 1.1L
- the density of octance is ~ 0.7 g/mL
- the current concentration of atmospheric CO2 is 400 ppm (parts per million)
- 1 ppm = 0.0001%

the question is based on greenhouse gas.

thanks for your help guys.

[Chemistry Tutor]

i can't help you too much because it is for a grade

i will tell you this, just follow your units! make them cancel and you will get there