When NaCl dissolves in water

Determine the number o moles of ions/atoms/particle in the following: 2.50 miles of k2s (let me know how to do)

In the 1800s, one of the statements in john dalton's atomic theory was that atoms are indivisible. later experimental evidence led to the discovery of subatomic particles such as neutrons, electrons, and protons. what happened to the indivisible atom part of dalton's atomic theory, and why?

How many moles of air are there in a human lung with a volume of 2.4 l at stp? explain your answer