Question

How many atoms are in 165 g of calcium?

Answer 1

Find the molar mass of calcium acetate...158.165g.
So start with 255g Calcium acetate x 1 mole Calcium Acetate/158.165 g Calcium Acetate x 6 mol Hydrogen/1 mole Calcium Acetate x 6.022e23 atoms/mole.

So...(255 x 1 x 6 x 6.022e23)/(158.165 x 1 x 1) = 5.825e24 hydrogen atoms

Answer 2

Moles in165g = 165 / 40 = N/6.02×10^23
N=2.48325×10^24
hope it helps