Tricky Chemistry Question?

Question

Each time you inhale, you take in about 500 mL of air, each milliliter of which contains 2.5x10^19 molecules. Lincoln inhaled 200 times during his run.

a) how many molecules did lincoln take in?

b) in the entire atmosphere, there are about 1.1x10^44 molecules. What fraction of the molecules in the earth's atmosphere was inhaled by lincoln during his run?

c) in the next breath that you take, how many molecules were inhaled by lincoln during his run?

I dont get this question, especially part c!!

help please!?

Answer 1

a)

Total Intake of Molecules

=No. of molecules per mL x No. of mL per inhale x No. of inhales.

=2.5x10^19 molecules/mL x 500mL/inhale x 200inhales

=2.5x10^24 molecules

b)

%age of Molecules Inhale = Molecules Inhaled / Total Molecules

2.5x10^24 molecules / 1.1x10^44

= 2.3x10^(-20)

= 2.3x10^(-18)%

c) Your breathing doesn't change how much Lincoln inhaled, it's a trick question.