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 transcript:

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

NaCl

Molar Mass = mass of one mole of NaCl

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

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

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

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

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

MgCl 2

Molar Mass = mass of one mole of MgCl 2

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

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

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

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 = g/mol35.45 g/mol35.45 g/mol

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 = g/mol35.45 g/mol35.45 g/mol g/mol g/mol g/mol g/mol MgCl 2

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

Converting Grams to Moles

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

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

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

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

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

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

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

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 = g MgCl 2

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 g MgCl 2