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 NO₂c) 0.807g BBr₃d) 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 FeCl₃c) 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 Li₂SO₄b) 1.2 x 10³kg LiOH c) 4.4 x 10²kg LiBr

39. a) 1.8 x 10³kg NaCl b) 1.6 x 10³kg Na₂CO₃c) 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

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