Question

What is the mass of 9.00 x 10 22 atoms of magnesium, Mg?

Answer 1

Hey there!

$\large\boxed{\text{3.6g}}$

One mole of magnesium has a mass of 24.31 g.

This is 6.022 x 10²³ atoms of magnesium.

We want to convert 9.00 x 10²² atoms to moles.

For every one mole of magnesium, there are 6.022 x 10²³ atoms, so divide:

(9.00 x 10²²) ÷ (6.022 x 10²³) = 0.15 moles

Convert 0.15 moles to grams.

For every mole, there is 24.31 g.

So we multiply by 24.31. Also note that I am using the number stored in the calculator and not the rounded number I put.

0.15 × 24.31 = 3.6

The mass of 9.00 x 10²² atoms of Mg is 3.6 grams.

Hope this helps!