Question

What is the molarity of a solution that has 29.25 grams of NaCl dissolved to make 1.5 L of a solution?

• A. $19.5$ M
• B. $3.0$ M
• C. $1.75$ M
• D. $0.33$ M
• E. $1.0$ M

Answer 1

Answer: (D)

$0.33$ M

The molar mass of $NaCl$ is
$23.0+35.5=55.5$ g/mol
29.25 grams of NaCl corresponds to
$\frac{29.25g}{55.5g/mol}=0.527$ moles.
The molarity of NaCl solution will be the ratio of the number of moles of $NaCl$ present in 1 L of solution.
The molarity of NaCl solution is $\frac{0.527moles}{1.5L}=0.33M$