Molarity is defined as the number of moles of solute in 1 L solution molarity of MgCl₂ solution to be prepared - 1.4 M volume of the solution to be prepared - 700 mL the number of moles of MgCl₂ in 1 L - 1.4 M therefore 700 mL should contain - 1.4 mol/L x 0.700 L = 0.98 mol molar mass of MgCl₂ - 95.2 g/mol mass of MgCl₂ required - 0.98 mol x 95.2 g/mol = 93.3 g mass of MgCl₂ required is 93.3 g
