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Step 2: Molar Conversions. …but first! Determine the molar mass for the compound assigned to your table. Table 1- NiSO 4 Table 2- AlCl 3 Table 3- NaIO 4 Table 4- N 2 O 6 Table 5- H 3 PO 4 Table 6- Sn(OH) 4 Table 7- Pr(OH) 3 Table 8- K 3 PO 4. WARNING!. We are about to do math… - PowerPoint PPT Presentation
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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