# Question #acc2c

Mar 23, 2016

Molarity = Moles/Liter
Moles = grams/gram-molecular weight

#### Explanation:

You can calculate the moles first, then corect for the volume or adjust the volume and mass togetther before calculating molarity. You have 32.1g of $K N {O}_{3}$ in 0.5L, or the equivalent of 64.2g in 1.0L.

32.1g/101.1g/mole $K N {O}_{3}$= 0.3175 mole
0.3175mole/0.5L = 0.635 M solution

or, 64.2g/101.1g/mole/1.0L = 0.635 M