Question

How would you make 100.0 mL of a 0.150 M NaCl solution?

Answer 1

There are a number of ways to express concentration of a solution. This includes molarity. It is expressed as the number of moles of solute per volume of the solution. For example, we are given a solution of 2M NaOH this describes a solution that has 2 moles of NaOH per 1 L volume of the solution. 

0.150 M NaCl = 0.150 mol NaCl / L solution

mass of NaCl needed = 0.150 mol NaCl / L solution ( .100 L ) (58.44 g/mol) = 87.66 g NaCl needed 

Hope this answers the question. Have a nice day.