# 6.E: Homework Chapter 6 Answers

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Conversion Factors

The Mole Concept

7. a) 13.6 mol As                     b) 0.0732 mol Ne                    c) 1.12 mol Li                           d) 3.49 x 10-3 mol S

9.  a) 35.4 mol He                   b) 0.0606 mol Ga                    c) 1.000 mol Mg                      d) 1.73 mol Cu

11. Complete the table:

 Element Moles Number of Atoms P 13.2 7.95 x 1024 P atoms Au 0.222 1.34 x 1023 Au atoms F 8.34 5.02 x 1024 Be 0.329 1.98 x 1023

13. Complete the table:

 Element Moles Mass N 5.38 75.4g W 0.0756 13.9g Ge 0.00784 0.569g Rb 4.09 350g

15. Complete the table:

 Element Moles Mass Li 244 1. 69 x 103g Y 0.653 58.1g B 1.91 20.7g He 0.00106 0.00422g

17. a) 3.30 x 1023 Al atoms                                          c) 1.94 x 1022 Co atoms

b) 5.98 x 1022 Ca atoms                                                d) 5.01 x 1023 S atoms

19. Complete the table:

 Element Mass Moles Number of Atoms Sn 433g 3.65 2.20 x 1024 Xe 12.9g 0.0983 5.92 x 1022 H 65.5mg 0.0650 3.91 x 1022 Si 203g 7.22 4.35 x 1024

21. Complete the table:

 Element Mass Moles Number of Atoms Be 226mg 0.0251 1.51 x 1022 S 0.0392g 0.00122 7.36 x 1020 Nb 9.66g 0.104 6.26 x 1022 N 0.00391kg 0.279 1.68 x 1022

23. a) 783g NaCl                      b) 1.03 x 104g NO2                        c) 0.807g BBr3                                   d) 28.1g XeO4

25. Complete the table:

 Compound Mass Moles Number of Molecules H2SO4 188kg 1.92 x 103 1.15 x 1027 NaBr 32.7g 0.318 1.91 x 1023 KClO3 4.05mg 3.3 x 10-5 1.99 x 1019 NH3 121g 7.10 4.28 x 1024

27. Complete the table:

 Compound Mass Moles Number of Molecules CH4 55.3g 3.45 2.08 x 1024 NaOH 42.2mg 0.00106 6.35 x 1020 LiCl 0.0911g 0.00215 1.29 x 1021 AgNO3 311g 1.83 1.10 x 1024

29. a) 46.5g KCN                     b) 1.68 x 104g FeCl3                    c) 3.20g HF                  d) 5.39 x 10-4g CO2

31. 4.2 x 1018 CuS form. units

33. 1.2 x 1014 C6H6 form. units

Chemical Formulas as Conversion Factors

35. a) 2.88 mol H                    b) 0.0298 mol H                      c) 0.00 mol H              d) 0.180 mol H

37. a) 2.8 x 103kg Li2SO4        b) 1.2 x 103kg LiOH               c) 4.4 x 102kg LiBr

39. a) 1.8 x 103kg NaCl         b) 1.6 x 103kg Na2CO3                   c) 1.7 x 103kg Na3PO4

41. 7.48 mol NH4OH has the greatest number of moles of hydrogen.

Mass Percent Composition

43. 37.49% C, 11.00% H, 29.29% O, 22.22% N

45. a) 48.00% O                      b) 49.95% O               c) 40.00% O                     d) 56.11% O

47. a) 1.19% H, 41.97% Cl, 56.83% O

b) 57.45% Ag, 42.55% Br

c) 68.32% Pb, 10.57% S, 21.10% O

d) 74.87% C, 25.13% H

Calculating Empirical Formulas

49. Empirical Formula: C3H6O

51. Empirical Formula:

53. Empirical Formula:

Calculating Molecular Formulas

55.

a) Molecular Formula: C5O10H5

b) C3Cl3N3

c) C4H6O2

d) C8H16O2

57. a) Molecular Formula: C18H24O3

b) Molecular Formula: C4H8N8O8

c) Molecular Formula: C2H7NS

d) Molecular Formula: C22H44O2

Challenge Problems

59. Complete the table:

 Substance Mass Moles Number of Particles CdF2 5.85g 0.0389 2.34 x 1022 N 17.3mg 0.00123 7.44 x 1020 Ag 1.02kg 9.46 5.69 x 1024 HNO3 0.476g 0.00756 4.55 x 1021

61. Molecular Formula: C12H8Cl6

63. Molecular Formula: C3H6O3

Name: Lactic Acid

6.E: Homework Chapter 6 Answers is shared under a not declared license and was authored, remixed, and/or curated by LibreTexts.