The mass of a single potassium atom is 6.50×10-23 grams. How many potassium atoms would there be in a sample of potassium with a volume of 190 cm3 if the density of potassium is 0.856 g/cm3?

Question

I need help answering this question for chemistry. How to solve it and the answer.

Answer 1

We would use dimensional analysis to convert, canceling out the units in the process:

190 cm³ x 0.856 g x 1 K atom = 2.50 x 10²⁴ atoms

1 cm³ 6.50 x 10^-23g