Calculate the number of atom in 3mode of mg

18.066  × 10²³ atoms

Explanation:

Given data:

Number of atoms of Mg = ?

Number of moles of Mg = 3 mol

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ atoms

3 mol   ×  6.022 × 10²³ atoms  / 1mol

18.066  × 10²³ atoms

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

the answer is a and have a great day