**Concentration:** Molarity
determining mols in a volume of solution

How many moles of solute NH Write out the definition for
molarity. M = moles solute/ liters of solution
Tabulate the quantites given
in the
question and the unknown
Convert the volume from milliliter to
liters to match the molarity definition volume unit
682 mL x 1 Liter / 1000 mL = 0.682 Liters of solution Use the definition of
molarity to cancel out volume and determine the moles of
solute.

**Example 2:
**

_{3} are
in 682. mL of 1.5 M NH_{3} solutions?

**SOLUTION**

**Step 1**

**Step 2**

_{3}

**Step 3**

**Step 4**
**mols solute = Molarity x
volume in Liters**
**moles solute = [ 1.5 mol ****NH _{3 }**

**Dr. Walt Volland, ****all rights reserved 1997-2005 revised March 29, 2005**