chemistry
posted by manny .
2.60
Hi here is a question I am having trouble with. I need help only on part c.
____________________________________________________________________________________________________________________________________________________________
Each time you inhale, you take in about 500 ml (two sigfigs) of air, each millileter of which contains 2.5 x 10^19 moleules. In delivering the Gettysburg Adress, Abraham Lincoln is estimated to have inhaled about 200 times.
a.) How many molecules did Lincoln take in?
My answer: 200 * (500 ml) * (2.5 x 10^19 molecules / 1 ml) =
2.5 x 10^24 molecules
b.) In the entire atmosphere, there are about 1.1 x 10^44 moleules. What fraction of the molecules in the Earth's atmosphere was inhaled by Lincoln at Gettysburg?
My Answer: (2.5 x 10^24)/(1.1 x 10^44)=
2.3 x 10^20
c.) In the next breath that you take, how many molecules were inhaled by Lincoln at Gettysburg?
***I don't understand what this part of the question is asking for. How do I go about this?
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