The molar mass of Mgl2 is
O the sum of the masses of 1 mol of Mg and 2 mol of I.
O the sum of the masses of 1 atom of Mg and 1 atom of I.
O the sum of the masses of 1 atom of Mg and 2 atoms of I.
O the sum of the masses of 1 mol of Mg and 1 mol of I.