Monday
May 20, 2013

# Homework Help: chemistry

Posted by T on Sunday, March 2, 2008 at 10:29pm.

I have more more problem i need some help figuring out. I really do not know how to even approach this problem; there is so much information.

- A newspaper article about the danger of global warming from the accumulation of greenhouse gases such as carbon dioxide states that "reducing driving your car by 20 miles a week would prevent the release of over 1000 pounds of C02 per year into the atmosphere". Is this a reasonable statement? Assume that gasoline is octane (C8H8) and that it is burned completely to CO2 and H20 in the engine of your car. The density of octane is .702/mL. There are 3.79L to one gallon, 2.20kg to one pound. Also assume that the average gas mileage in the United States is 22 miles per gallon. (Hint: you will start with one year and ehd with pounds of CO2)

Any ideas of the steps needed to complete this problem? It would be really appreciated.

Thanks

• chemistry - DrBob222, Sunday, March 2, 2008 at 10:58pm

2C8H18 + 25O2 ==>16CO2 + 18H2O

20 mi/week x (52 weeks/1 yr)x (1 gal/22 mi) = ?? gallons/year.

Now convert gallons to liters and liters to kg, then go through the stoichiometry to how many kg of CO2 are released and change all that information back to pounds and compare with 1000 lbs.

• chemistry - DrBob222, Monday, March 3, 2008 at 12:34am

I just spent an hour trying to find an error in some quick estimates I did on this BEFORE I FINALLY notice that your conversion factor for kg/lbs is not right. You should have 2.2 pounds = 1 kg and not the other way around. I am posting this hoping I can save you that hour of wasted time.

• chemistry - T, Monday, March 3, 2008 at 9:40pm

Opps. That must have been a mistake made by the teacher when typing because I just looked back at an extra i had of the worksheet and it is printed exactly as i typed it.

no worries. i did my best.

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