Step 2: Molar Conversions

…but first! Determine the molar mass for the compound assigned

to your tableTable 1-

NiSO4

Table 2- AlCl3

Table 3- NaIO4

Table 4- N2O6

Table 5-

H3PO4

Table 6- Sn(OH)4

Table 7- Pr(OH)3

Table 8- K3PO4

WARNING!We are about to do math…

Everyone complain for 5 seconds!

Molar ConversionsSometimes we need to know how many moles of

a substance but all we know is the mass

OR

We need to know what mass is necessary to give us a certain number of moles of a substance

This is when we need to be able to convert from moles to grams or grams to moles

So how do I do a molar conversion???

1. Write down what you know

2. Determine what needs to be converted (is it g mol or mol g)

3. Calculate the molar mass

4. Set up a conversion factor to cancel out the units you do not want (all that should be left is the final unit you are solving for)

5. Solve!

ExampleHow many moles are there in 15 grams of lithium?

Start with what we know: 15g Li

Next how will we convert this: We need to convert gmol

What is the molar mass? 6.94

In order to cancel out unwanted units, we will need to multiply the number of moles per gram1 mol / 6.94 g

Complete the calculation

2.2 mol Li

ExampleHow many grams in 2.2 moles of sulfur?

Start with what we know: 2.2 moles S

Next how will we convert this: We need to convert molg

What is the molar mass? 32

In order to cancel out unwanted units, we will need to multiply the number of grams per mol32 g Mg/ 1 mol Mg

Complete the calculation

70.4 mol Mg

ExampleHow many grams are in 4.5 moles of Sodium

Flouride, NaF?

Start with what we know:

Next how will we convert this:

What is the molar mass?

In order to cancel out unwanted units, we will need to:

Complete the calculation

Exit Ticket: How many moles in 5g of your

compound? Table 1- NiSO4

Table 2- AlCl3

Table 3- NaIO4

Table 4- N2O6

Table 5- H3PO4

Table 6- Sn(OH)4

Table 7- Pr(OH)3

Table 8- K3PO4