Question

2.) How many grams are in 4.23 x 1024 atoms of He?

Answer 1

Hey there!

First convert atoms to moles.

There are 6.022 x 10²³ atoms in a mole.

We have 4.23 x 10²⁴ atoms.

(4.23 x 10²⁴) ÷ (6.022 x 10²³) = 7.024 moles

The molar mass of helium is 4.00 grams.

4.00 x 7.024 = 28.1

There are 28.1 grams in 4.23 x 10²⁴ atoms of He.

Hope this helps!