Mole Conversions

Today we practiced our mole conversions. The first step to this is calculating molar mass.
Add up all the molecular masses of the compound:
Ex. H2O ---->
mass of 1 oxygen atom = 16.0g

mass of 2 hydrogen atoms = 2.0g

16.0+2.0 = 18.0 therefore the molar mass for H2O is 18g/mol

Remember to use Avogadro's number when converting Particles/atoms/molecules

We also did some examples in class from our Mole Conversions Exercise A-C, this involved converting:
Moles to particles/atoms/molecules
Particles/atoms/molecules to moles
Moles to grams

Ex.. Moles to atoms

How many atoms are present in 3 moles of sulphur

3 moles S x 6.022x1023/1 mole = 1.81 x 1025 Atoms


Ex. Atoms to moles

How many moles of Al are present in 2.6 x 1012 atoms of Aluminum

2.6 x 1012 atoms Al x 1 mole/6.022 x 1023 atoms = 4.32 x 10-12 Moles


Ex. Moles to grams

What is the mass in grams of 12 moles of Fluorine gas

12 moles Fl  x 19g/1mole = 228g of Fluorine