6.E: Homework Chapter 6 Answers
- Page ID
- 202160
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