- #26

- 36,230

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12g of C produce 44g CO2, remember? So many g of CO2 will 36,315 g of Carbon produce?So 1 gallon of gasoline contains 36,315 g of Carbon which will produce 70 g of CO2 but then what?

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- Thread starter courtneywetts
- Start date

- #26

- 36,230

- 6,841

12g of C produce 44g CO2, remember? So many g of CO2 will 36,315 g of Carbon produce?So 1 gallon of gasoline contains 36,315 g of Carbon which will produce 70 g of CO2 but then what?

- #27

- 80

- 0

12g of C produce 44g CO2, remember? So many g of CO2 will 36,315 g of Carbon produce?

Would I just divide these two?

- #28

- 36,230

- 6,841

Would I just divide these two?

12g of C produce 44g CO2.

So 1g of C produces .. how many g of CO2?

So 36,315 g of Carbon produce.. how many g of CO2.?

- #29

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12g of C produce 44g CO2.

So 1g of C produces .. how many g of CO2?

So 36,315 g of Carbon produce.. how many g of CO2.?

When I did this as a ratio I got 133,155 g of CO2 but thats still not the answer in the back of the book is there another step?

- #30

- 36,230

- 6,841

Yes, you haven't used the final ratio: 70g CO2 corresponds to 1MJ energy.When I did this as a ratio I got 133,155 g of CO2 but thats still not the answer in the back of the book is there another step?

If 1 gal gasoline releases 133,155 g of CO2, and each 70g CO2 indicates 1MJ of energy, how many MJ for the whole gallon?

- #31

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Yes, you haven't used the final ratio: 70g CO2 corresponds to 1MJ energy.

If 1 gal gasoline releases 133,155 g of CO2, and each 70g CO2 indicates 1MJ of energy, how many MJ for the whole gallon?

When I did this I got 1902.214 MJ. Is this right?

If so how would I go about doing part B?

- #32

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Wait I realized that is only for 1 gallon so I got 28530 MJ

- #33

- 36,230

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Right!When I did this I got 1902.214 MJ. Is this right?

that is only for 1 gallon so I got 28530 MJ

This is much easier. you have 15 gals at 12.8 MJ/m^3.If so how would I go about doing part B?

- #34

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Right!

This is much easier. you have 15 gals at 12.8 MJ/m^3.

I don't understand what this means though? Is this all the information I need?

- #35

- 36,230

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The only other information you need is how to convert US gallons to mI don't understand what this means though? Is this all the information I need?

- #36

SteamKing

Staff Emeritus

Science Advisor

Homework Helper

- 12,796

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Yes. So you have, for burning gasoline:

So how many J energy correspond to 1 gallon gasoline?

- 12 atomic masses C corresponds to 44 atomic masses CO2
- 70g CO2 corresponds to 1MJ energy
- 1 gallon gasoline corresponds to 36,315 g C

This is incorrect. According to the attachment in Post #4, 1 gallon of gasoline has a carbon content of 2421 g, not 36,315 g. The latter figure is for 15 gallons of gasoline.

- #37

- 36,230

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Well spotted - thanks. But fortunately courtneywetts used the right ratio later.This is incorrect. According to the attachment in Post #4, 1 gallon of gasoline has a carbon content of 2421 g, not 36,315 g. The latter figure is for 15 gallons of gasoline.

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