Question

What is the molarity of a solution containing 17.2 g of KCl in 294 mL of solution

Answer 1

To calculate molarity: M=mol
-----
Liters of solution

We may not have moles but, we can calculate by converting grams to moles by dividing by the GFM of KCl (74 g/mol):

17.2g
--------= .232 mol
74g/mol

Now, we must convert 294 mL to liters which is, .294 liters.

We are now able to apply the molarity calculation:

M=mol
-----
L
M=.232mol
----------= .789 M (answer is left in sig figs**)
.294 liters