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3/4/2016 I ObjectiveDo Now Convert grams of a substance to moles of a substance. Calculate the molar mass of: NaCl MgCl 2.

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Presentation on theme: "3/4/2016 I ObjectiveDo Now Convert grams of a substance to moles of a substance. Calculate the molar mass of: NaCl MgCl 2."— Presentation transcript:

1 3/4/2016 I ObjectiveDo Now Convert grams of a substance to moles of a substance. Calculate the molar mass of: NaCl MgCl 2

2 NaCl

3 Molar Mass = mass of one mole of NaCl

4 NaCl Molar Mass = mass of one mole of NaCl One Mole = 6.02*10 23 molecules of NaCl

5 NaCl Molar Mass = mass of one mole of NaCl One Mole = 6.02*10 23 molecules of NaCl Na Cl

6 Molar Mass = mass of one mole of NaCl One Mole = 6.02*10 23 molecules of NaCl Na Cl 1 mole

7 NaCl Molar Mass = mass of one mole of NaCl One Mole = 6.02*10 23 molecules of NaCl Na Cl 1 mole Molar mass = 22.99 g/mol Molar mass = 35.45 g/mol

8 NaCl Molar Mass = mass of one mole of NaCl One Mole = 6.02*10 23 molecules of NaCl Na Cl 1 mole Molar mass = 22.99 g/mol Molar mass = 35.45 g/mol 22.99 g/mol + 35.45 g/mol = 58.44 g/mol NaCl

9 MgCl 2

10 Molar Mass = mass of one mole of MgCl 2

11 MgCl 2 Molar Mass = mass of one mole of MgCl 2 One Mole = 6.02*10 23 molecules of MgCl 2 Mg Cl 2

12 Molar Mass = mass of one mole of MgCl 2 One Mole = 6.02*10 23 molecules of MgCl 2 MgClCl

13 MgCl 2 Molar Mass = mass of one mole of MgCl 2 One Mole = 6.02*10 23 molecules of MgCl 2 MgClCl 1 mole1 mole1 mole

14 MgCl 2 Molar Mass = mass of one mole of MgCl 2 One Mole = 6.02*10 23 molecules of MgCl 2 MgClCl 1 mole1 mole1 mole Molar Mass = 24.31 g/mol35.45 g/mol35.45 g/mol

15 MgCl 2 Molar Mass = mass of one mole of MgCl 2 One Mole = 6.02*10 23 molecules of MgCl 2 MgClCl 1 mole1 mole1 mole Molar Mass = 24.31 g/mol35.45 g/mol35.45 g/mol 24.31 g/mol 35.45 g/mol + 35.45 g/mol 95.21 g/mol MgCl 2

16 Reminders Homework: Read page 322 in your textbook and determine the number of molecules in each problem of today’s handout.

17 Converting Grams to Moles

18 What if I accidentally weigh out 96.21 g of MgCl 2 ? How many moles is that?

19 Converting Grams to Moles What if I accidentally weigh out 96.21 g of MgCl 2 ? How many moles is that? Dimensional Analysis 96.21 g MgCl 2

20 Converting Grams to Moles What if I accidentally weigh out 96.21 g of MgCl 2 ? How many moles is that? Dimensional Analysis 96.21 g MgCl 2 X 1.0 mol MgCl 2 95.21 g MgCl 2

21 Converting Grams to Moles What if I accidentally weigh out 96.21 g of MgCl 2 ? How many moles is that? Dimensional Analysis 96.21 g MgCl 2 X 1.0 mol MgCl 2 95.21 g MgCl 2

22 Converting Grams to Moles What if I accidentally weigh out 96.21 g of MgCl 2 ? How many moles is that? Dimensional Analysis 96.21 g MgCl 2 X 1.0 mol MgCl 2 = 1.01 mol MgCl 2 95.21 g MgCl 2

23 Converting Grams to Moles What if I only have 2.0 g of MgCl 2 ? How many moles is that?

24 Converting Grams to Moles What if I only have 2.0 g of MgCl 2 ? How many moles is that? Dimensional Analysis 2.0 g MgCl 2

25 Converting Grams to Moles What if I only have 2.0 g of MgCl 2 ? How many moles is that? Dimensional Analysis 2.0 g MgCl 2 X 1.0 mol MgCl 2 = 95.21 g MgCl 2

26 Converting Grams to Moles What if I only have 2.0 g of MgCl 2 ? How many moles is that? Dimensional Analysis 2.0 g MgCl 2 X 1.0 mol MgCl 2 = 0.02 mol MgCl 2 95.21 g MgCl 2

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