(Ifyoudon’tlikehavingoneandahalfoxygenmolecules,youcanthinkoftwohydrocarbonsplusthree
oxygensmakingtwocarbondioxidesandtwowaters;itisthesamething,really.)
In burning, each carbon atom, C, in gasoline eliminates two hydrogens and replaces them with two oxygens
each carbon atom weighs 12 atomic mass units
each hydrogen weighs 1
each oxygen weighs 16;
So, CH2 starts out weighing 14 (12 from carbon and 2 from hydrogen), and CO2 ends up weighing 44 (12
from carbon and 32 from oxygen)—the weight has more than tripled.
Rounding that off a little,
thetotalweightofCO2putoutbyatypicalU.S.driveristhreetimeslargerthanthe
weightofgasolineburned.
To get the number of pounds of CO2 per year from a typical car, then, multiply your answer from the previous
question by 3.
A) 216,000 pounds / year
B) 1,080 pounds / year
C) 108,000 pounds / year
D) 10,800 pounds / year
4.
Total Pounds (or Tons) of CO
2
Produced by U.S. Drivers per Year Calculation:
Imagine for a moment that the CO
2
behaved like horse ploppies, making a pile in the road, rather than wafting
away in the atmosphere.
How much would we have?
Here are your necessary facts:
There are roughly 140,000,000 cars in the country
Each car averages 12,000 miles per year
Each car is producing @ 1 pound of CO
2
per car per mile
How many pounds of CO
2
are produced each year by U.S. drivers?
To get this number, simply multiply the 3 variables above for this answer. This is a big number one that
cheaper calculators won't be able to handle. In this case, you'll want to come up with the number of tons
instead of the number of pounds of CO
2
. (2000 lbs = 1 ton).
The formulas will look like this;
Points Earned:
2.0/2.0
Correct Answer(s):
D

11/8/2016
Exercise #6: Fossil Fuels (& Driving Hazards)
3/4
Total
Pounds
of CO
2
produced in a year by U.S. drivers: # of cars X # of miles per car X pounds of CO
2
per
mile
Total
Tons
of CO
2
produced in a year by U.S. drivers:(# of cars / 2000) X # of miles per car X pounds of CO
2
per mile

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- Fall '08
- ALLEY,RICHARDBANANDAKRISHNAN,SR
- CO2, Geosc10, Geosc010, Exercise 6, pounds