What is the molarity of a bleach solution containing 6.2 g of NaOCl per liter of bleach?

i'm not sure if i need to know the molar mass of bleach or how to even set this equation up..

any suggestions?

Answer:
You will need the molar mass of NaOCl. Molar mass is defined as mass in grams per mole of substance. You can find out how many moles you have by dividing 6.2 g by the molar mass. Now that you have moles, you can find moles per liter by dividing the number of moles by the number of liters (in this case 1).

So the equation is:

Molarity = # of grams / molar mass / # of liters

This will be true for any pure substance in solution.
You don't need to know the molar mass of bleach. The problem is specifically talking about NaOCl. Therefore, we must find the molar mass of NaOCl by adding the masses of Na, O and Cl.

Molar mass (NaOCl) = 22.99 + 15.99 + 35.45 = 74.44 g/mol

Now, just do some simple dimensional analysis:

6.2 g NaOCl/L bleach * 1 mol NaOCl/74.44 g = 0.083 mol NaOCl/L bleach

* The molarity of the solution is 0.083 moles of NaOCl (sodium hypochlorite) per liter of bleach.
Yes, you need to know the molar mass of NaOCl becuase you need to find moles to be able to find molarity.

6.2 grams of NaOCl / 74.44 moles per gram = 0.08 moles.


Molarity = moles of solute / liters of solution

0.08 moles / 1 liter = 0.08M
molarity = moles/liters

6.2g NaOCl / 74.5 g/mole = 0.083 mol NaOCl

0.083 mol / 1 L = 0.083 mol/L
0.083 mol NaOCl/L bleach

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