1. The Mole and its Conversions
Chemistry 11
Ms. McGrath

2. The Mole and its Conversions
We will be looking at:
Converting Moles to Number of Particles (Atoms, Molecules or Formula Units)
Converting Number of Particles (Atoms, Molecules or Formula Units) to Moles

3. The Mole and its Conversions Converting Moles to Number of Particles
The relationship between moles, number of particles and the Avogadro constant is:
N = n x NA
where:
N = number of particles
n = amount (mol)
NA = Avogadro’s constant (6.02 x 1023)

4. The Mole and its Conversions Converting Moles to Number of Particles
A sample contains 1.25 mol of nitrogen dioxide, NO2.
How many molecules are in the sample?
How many atoms are in the sample?

5. The Mole and its Conversions Converting Moles to Number of Particles
A small pin contains mol of iron, Fe. How many atoms are in the pin?

6. The Mole and its Conversions Converting Number of Particles to Moles
Recall the equation we used previously:
N = n x NA
To convert the number of particles to moles we rearrange the equation.
n = N NA

7. The Mole and its Conversions Converting Number of Particles to Moles
How many moles are present in a sample of carbon dioxide, CO2, made up of 5.83 molecules?