molarity is defined as the number of moles of solute in volume of 1 L solution. The molarity of solution to be prepared is 4.5 M the volume of solution to be prepared is 1 L therefore number of moles in 1 L - 4.5 mol mass of NH₄Cl required - 4.5 mol x 53.5 g/mol = 240.8 g A mass of 240.8 g of NH₄Cl is required to make a solution of 4.5 M
