if you have 4.6*10^16 atoms of chlorine, how many moles of AlCl3 can be made

Question

Thank you in advance

Answer 1

There are a couple of ways to solve this.

(1) Each mole of AlCl₃ contains 3 mols of Cl atoms

4.6x10¹⁶ Cl atoms x 1 mol Cl atoms / 6.022x10²³ atoms = 7.64x10^-8 Cl atoms

7.64x10^-8 Cl atoms x 1 mol AlCl₃ / 3 mols Cl atoms = 2.5x10^-8 mols AlCl₃

(2) Each formula unit of AlCl₃ contains 3 Cl atoms

4.6x10¹⁶ Cl atoms x 1 form. unit AlCl₃ / 3 Cl atoms = 1.53x10¹⁶ form. units of AlCl₃

1.53x10¹⁶ form. units of AlCl₃ x 1 mol AlCl₃ / 6.022x10²³ form. units = 2.5x10^-8 moles AlCl₃