Solution: Which of the following would be used to make a 0.40 M NaCl solution (NaCl mass and water volume, respectively)A. 29.2 g, 500 mL B. 58.4 g, 4.00 L C. 11.7 g, 400 mL D. 58.4 g, 1.00 L E. 5.84 g, 250 mL

Determine which among the choices will produce 0.40 M NaCl using the formula for molarity

Recall that molarity is

$\boxed{\mathbf{Molarity}\mathbf{ }\mathbf{=}\mathbf{ }\frac{\mathbf{moles}\mathbf{ }\mathbf{of}\mathbf{ }\mathbf{solute}}{\mathbf{L}\mathbf{ }\mathbf{of}\mathbf{ }\mathbf{solution}}}$

Calculate each molarity produced by each choice where the molar mass of NaCl is:

NaCl             1 Na × 22.99 g/mol Na = 22.99 g/mol
                     1 Cl × 35.45 g/mol Cl = 35.45 g/mol
                               Sum = 58.44 g/mol

A. 29.2 g, 500 mL (1 mL = 1x10^-3 L)