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Step 2: Molar Conversions

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…

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Step 2: Molar Conversions

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  1. Step 2: Molar Conversions

  2. …but first! Determine the molar mass for the compound assigned to your table • 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

  3. WARNING! We are about to do math… Everyone complain for 5 seconds!

  4. Molar Conversions • Sometimes 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

  5. So how do I do a molar conversion??? • Write down what you know • Determine what needs to be converted (is it g mol or mol g) • Calculate the molar mass • 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) • Solve!

  6. Example How 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 gmol • What is the molar mass? 6.94 • In order to cancel out unwanted units, we will need to multiply the number of moles per gram • 1 mol / 6.94 g • Complete the calculation • 2.2 mol Li

  7. Example How 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 convertmolg • What is the molar mass? 32 • In order to cancel out unwanted units, we will need to multiply the number of grams per mol • 32 g Mg/ 1 mol Mg • Complete the calculation • 70.4 mol Mg

  8. Example How 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

  9. 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

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