Question

Calculate the molar concentration of a 650 mL solution containing 40.0 grams of dissolved Na2S

Answer 1

Answer:

7.87m/L

Explanation:

from the que we have to Calculate the molarity of a solution,

molarity=moles/vol of soln.

           =$\frac{given weight}{molecular mass}$×$\frac{1000}{V}$

molarity =  $\frac{40}{78}$×$\frac{1000}{650}$

            =(0.512)(15.38)

            =7.8745

molarity =  7.87 m/L