What percentage of the total amount of CO2 in the atmosphere is 7.7 billion

Physics
Tutor: None Selected Time limit: 1 Day

I need the answer for question 6 ( it's related to question 5) pleease.  Thnx

Question 5:  COcomprises 0.05 percent (1/20 of 1 %) by weight of the atmosphere (see table 1).  What is the weight of  COin tonnes in the atmosphere?

Question 6:    World COemission from deforestation and burning of fossil fuel exceeds 7.7 billion tonnes per year and is increasing.   What percentage of the total amount of CO2    in the atmosphere (calculated in Question 5) is 7.7 billion (7.7 X 109) tonnes.

May 5th, 2015

If CO2 in the atmosphere is 1/20 of the total weight of the atmosphere, and the atmosphere weighs 5.5 quadrillion tons (that is, 5.5 x 10^15), then CO2 makes up 2.75 x 10^14. 

For question 6, 7.7 billion out of 2.75 x 10^14 is .0028. The amount of CO2 given off from deforestation an burning of fossil fuels makes up less than 1 percent of all the CO2 in the atmosphere.

May 5th, 2015

Thanks soo much Doctor T.  Keep up the good work

May 5th, 2015

No problem.

May 5th, 2015

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