[CHOOHO]

Each time you inhale, you take in about 500.0mL of air where each milliliter of air contains about 2.5 x 1019 molecules. It has been estimated the Abraham Lincoln, in delivering the Gettysburg address, inhaled about 200 times.
 a. How many molecules did Lincoln take in over his speech?
 b. In the entire atmosphere, there are about 1.8 x 1020 moles of air. What fraction of the molecules in the Earth’s atmosphere were inhaled by Lincoln during his speech?
 c. In the next breath that you take, estimate the number of molecules that you inhaled that were inhaled by Lincoln. (sharing is caring)

*delete me*

[Borek]

I already gave you hints for other questions, even if you failed to show your efforts at solving them. Won't happen for the third time in a row. At least first two points are painfully obvious.

[sjb]

Each time you inhale, you take in about 500.0mL of air where each milliliter of air contains about 2.5 x 10¹⁹ molecules. It has been estimated the Abraham Lincoln, in delivering the Gettysburg address, inhaled about 200 times.
 a. How many molecules did Lincoln take in over his speech?
 b. In the entire atmosphere, there are about 1.8 x 10²⁰ moles of air. What fraction of the molecules in the Earth’s atmosphere were inhaled by Lincoln during his speech?
 c. In the next breath that you take, estimate the number of molecules that you inhaled that were inhaled by Lincoln. (sharing is caring)

*delete me*

If I count 500 peanuts, and I count more peanuts such that I count this number 200 times, how many peanuts do I count in total? If each batch of 500 peanuts weighs 2.5 kg, what mass in total do I take?