Question

How many moles are in 1.08 x 10^26 atoms of He?

Answer 1

Answer: 179 mols

Step-by-step explanation:

1 mole = 6.02 x 1023 atoms

Avogadro’s number: 6.02 x 1023

Use Dimensional Analysis to solve.

(1.08 x 10^26 atoms/1 mole) x (1 mole/ 6.02 x10^23) = (1.08x 10^26)/(6.02x 10^23) = 179.4019934

179 moles

There are 3 significant figures.