Question

Question #f9082

Answer 1

Molarity is a comparison of the moles of solute dissolved in a given volume of solution.

This equation is `Molarity = (mol of solute)/ (Liters of Solution)`

If we want to find how many grams of `KCl` are necessary to make a solution that is 0.150 M and contains 125 mL, we would solve using the equation

First we must find the moles of KCl in solution.

`M = (mol)/ L`

M = 0.150 M
mol = ???
L = 125 mL or 0.125 L

`M L = mol`

`0.150M (0.125 L) = x mol`

mol = 0.0188 moles of KCl

Now we can convert moles to grams

`0.0188 mol KCl x (74.55 g KCl) / (1 mol)`

= 1.39 grams of KCl

I hope this was helpful.
SMARTERTEACHER