Answer to Question #143979 in General Chemistry for Javier

Question

What is the molarity of a solution containing 60.0 grams of KCl in 0.500 L of solution?

Answer 1

Solution:

Molar concentration (С) is calculated by dividing the moles of solute (n) by the total volume (V) of the:

С = n/V

We must convert the mass of KCl in grams into moles. We do this by dividing by the molecular weight of KCl (74.55 gram/mol).

n = 60.0 gram KCl / 74.55 gram/mol = 0.805 mol KCl

Then, we divide the number of moles by the total solution volume to get concentration.

C = 0.805 mol / 0.500 L = 1.61 M

Answer: the molarity is a 1.61 M.