Be able to set up and successfully convert moles and atoms

Answer & Explanation:

To convert between moles and atoms, we must mention that:

Every 1.0 mole of an atom or molecule contains Avogadro's no. of molecules (6.022 x 10 ²³).

If we have an atom X and has n moles, we can get the no. of atoms of X in n moles using cross multiplication.

1.0 mole of X contains → 6.022 x 10 ²³ atoms.

n moles of X contains →? atoms.

∴ no. of atoms in n moles of X = (n moles) (6.022 x 10 ²³) / (1.0 mole).

If we have a compound AB₂, and has n no. of moles of the compound.

1.0 mole of AB₂ contains → 6.022 x 10 ²³ molecules.

n moles of AB₂ contains →? molecules.

∴ no. of molecules in n moles of compound AB₂ = (n moles) (6.022 x 10 ²³) / (1.0 mole).

Every 1.0 molecule of AB₂ contains 1.0 atom of A and 2.0 atoms of B.

∴ no. of atoms of A in n moles of compound AB₂ = (n moles) (6.022 x 10 ²³) / (1.0 mole).

∴ no. of atoms of B in n moles of compound AB₂ = 2 [ (n moles) (6.022 x 10 ²³) / (1.0 mole) ].