Harder Mole Conversions

We learned how to do harder mole conversions.

This means converting from moles to number of atoms for example, where there are multiple steps involved.
One helpful way to do this is to use a mole map.

Here is an example:

Grams----------> Moles----------------> Number of Particles------> #  of Atoms in a Particle



To do this you need to know the operations involved in conversion.

Grams to moles = 1mole/ MMG
Moles to Number of Particles= 1 mole/ 6.022 x 10^23 particles
Number of Particles to Number of atoms = Number of atoms in a particle / 1 molecule of that substance

Going the other way, everything is flipped.

Number of atoms to number of particles= 1 molecule of that substance/ number of atoms in one particle
Number of particles to moles= 1 mole/6.022 x 10^23 particles
Moles to grams = MMG/ 1 mole


Here are 2 examples

Convert 20 g of CO2 into number of atoms of O

First find the molar mass which equals

1 C = 12.0 g/mol
2 O = 32.0 g/mol

so...

20g CO2 x 1 mole/ 44.0g x 6.022 x 10^23/ 1 mole x 2 atoms O/1 molecule CO2=

= 5.47 x 10^ 23 atoms of O



2) Convert 2.34 x 10^ 23 molecules of CaCO3 into grams

= figure out Molar mass of  CaCO3
= 1 Ca = 40.1 g/mol
=1 C =12.0g/mol
=3 O = 16.0 g/mol

= 100.1 g/mol

so ..

2.34 x 10^23 molecules of CaCO3 x 1 mole/6.022 x 10^23 particles x 100.1 g/ 1 mole =

= 38.9 g CaCO3