About this molarity calculator
Molarity is moles of solute per litre of solution: M = mass ÷ molar mass ÷ volume in litres. 14.61 g of sodium chloride is 14.61 ÷ 58.44 = 0.25 mol; in 0.5 L that is 0.5 M. Reverse it to make a solution: mass = M × molar mass × litres.