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General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc. 1 Chapter 6 Chemical Reactions and Quantities 6.5 Molar Mass.

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Presentation on theme: "General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc. 1 Chapter 6 Chemical Reactions and Quantities 6.5 Molar Mass."— Presentation transcript:

1 General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc. 1 Chapter 6 Chemical Reactions and Quantities 6.5 Molar Mass

2 General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc. 2 The molar mass is  the mass of one mole of a substance  the atomic mass of an element expressed in grams Molar Mass

3 General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc. 3 Give the molar mass to the nearest 0.1 g. A. K = ________ B. Sn = ________ Learning Check

4 General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc. 4 Give the molar mass to the nearest 0.1 g. A. K =39.1 g B. Sn =118.7 g Solution

5 General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc. 5 Molar Mass of CaCl 2  For a compound, the molar mass is the sum of the molar masses of the elements in the formula. We calculate the molar mass of CaCl 2 to the nearest 0.1 g as follows. ElementNumber of Moles Atomic MassTotal Mass Ca140.1 g/mole 40.1 g Cl235.5 g/mole 71.0 g CaCl g

6 General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc. 6 Molar Mass of K 3 PO 4 Determine the molar mass of K 3 PO 4 to 0.1 g. ElementNumber of Moles Atomic MassTotal Mass in K 3 PO 4 K339.1 g/mole g P131.0 g/mole 31.0 g O416.0 g/mole 64.0 g K 3 PO g

7 General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc. 7 One-Mole Quantities 32.1 g 55.9 g 58.5 g g g

8 General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc. Guide to Calculating Molar Mass 8

9 General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc. 9 Calculate the molar mass for Al(OH) 3 to the nearest 0.1g. 1) 44.0 g/mole 2) 75.0 g/mole 3) 78.0 g/mole Learning Check

10 General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc. 10 STEP 1 Obtain the molar mass of each element. Al 27.0 g/mole O 16.0 g/mole H 1.0 g/mole STEP 2 Multiply each by the subscript in the formula. 1 mole Al x 27.0 g Al = 27.0 g 1 mole Al 3 moles O x 16.0 g O = 48.0 g 1 mole O 3 moles H x 1.0 g H = 3.0 g 1 mole H STEP 3 Total: 1 mole of Al(OH) 3 = 78.0 g (3) Solution

11 General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc. 11 Prozac, C 17 H 18 F 3 NO, is an antidepressant that inhibits the uptake of serotonin by the brain. What is the molar mass of Prozac? 1) 40.0 g/mole 2) 262 g/mole 3) 309 g/mole Learning Check

12 General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc. 12 3) 309 g/mole STEP 1 Obtain the molar mass of each element. C 12.0 g/mole H 1.0 g/mole F 19.0 g/mole N 14.0 g/mole O 16.0 g/mole STEP 2 Multiply each by the subscript in the formula. 17 moles C x 12.0 g C = 204 g 1 mole C 18 moles H x 1.0 g H = 18 g 1 mole H Solution

13 General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc. 13 STEP 2 (continued) 3 moles F x 19.0 g F = 57.0 g 1 mole F 1 mole N x 14.0 g N = 14.0 g 1 mole N 1 mole O x 16.0 g O = 16.0 g 1 mole O STEP 3 Total: 1 mole of C 17 H 18 F 3 NO = 309 g Solution (continued)

14 General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc. 14 Methane (CH 4 ), known as natural gas, is used in gas stoves and gas heaters. 1 mole of CH 4 = 16.0 g of CH 4 The molar mass of methane can be written as conversion factors g CH 4 and 1 mole CH 4 1 mole CH g CH 4 Conversion Factors from Molar Mass

15 General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc. 15 Acetic acid, C 2 H 4 O 2, gives the sour taste to vinegar. Write an equality and two molar mass conversion factors for acetic acid. Learning Check

16 General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc. 16 Acetic acid, C 2 H 4 O 2, gives the sour taste to vinegar. Write an equality and two molar mass conversion factors for acetic acid. Equality: 1 mole of acetic acid = 60.0 g of acetic acid Molar mass conversion factors: 1 mole acetic acid and 60.0 g acetic acid 60.0 g acetic acid 1 mole acetic acid Solution

17 General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc. 17 Guide to Calculations Using Molar Mass

18 General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc. 18 Aluminum is often used for the structure of lightweight bicycle frames. How many grams of Al are in 3.00 moles of Al? 3.00 moles Al x 27.0 g Al = 81.0 g of Al 1 mole Al mole factor for Al Calculating Grams from Moles

19 General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc. 19 The artificial sweetener aspartame (NutraSweet), C 14 H 18 N 2 O 5, is used to sweeten diet foods, coffee, and soft drinks. How many moles of aspartame are present in 225 g of aspartame? Learning Check

20 General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc. 20 STEP 1 Given: 225 g of aspartame, C 14 H 18 N 2 O 5 STEP 2 Plan: g of aspartame moles of aspartame STEP 3 Determine molar mass of aspartame: 14(12.0) + 18(1.0) + 2(14.0) + 5(16.0) = 294 g/mole STEP 4 Set up problem to calculate the moles of aspartame: 225 g aspartame x 1 mole aspartame 294 g aspartame mole factor (inverted) = mole of aspartame Solution

21 General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc. Converting Between Mass, Moles, and Particles 21


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