Question

the molar mass of naoh is 40.00 g/mol. if 5.20 g naoh are dissolved in 0.500 l of solution, what is the molarity of the solution? use molarity = \frac{moles of solute}{liters of solution}. 0.0125 m 0.260 m 3.85 m 7.69 m

Explanation:

Step1: Calculate moles of NaOH

Use the formula $n=\frac{m}{M}$, where $m = 5.20\ g$ and $M=40.00\ g/mol$. So $n=\frac{5.20\ g}{40.00\ g/mol}= 0.13\ mol$.

Step2: Calculate molarity

Use the molarity formula $M=\frac{n}{V}$, where $n = 0.13\ mol$ and $V = 0.500\ L$. So $M=\frac{0.13\ mol}{0.500\ L}=0.260\ M$.

Answer:

B. 0.260 M