Question

A solution with a total volume of 2.5 liters is composed of 31.4 grams of Na2S in water. What is the: molarity of this solution

Answer 1

0.1608 mol/L

Step-by-step explanation:

Calculate moles as,

Mole = Mass/M.Mass

Mole = 31.4 g / 78.045 g/mol

Mole = 0.402 mol

Now,

Molarity = Moles / Vol. in L

Molarity = 0.402 mol / 2.5 L

Molarity = 0.1608 mol/L