Honors Chemistry
Chapter 3 Homework Solutions
6.
The atomic number
7.
a. Atoms of an element that contain the same # of protons but a different # of neutrons
b. They have the same # of protons and electrons
c. They have different # of neutrons
8.
Isotope Protons Electrons Neutrons
Si-28
14
14
14
Si-29
14
14
15
Si-30
14
14
16
10.
Any isotope of any element
11.
a. He-4
b. O-16
c. K-39
12.
a. Carbon-12
b. exactly 12 amu
17.
18.
a. 6.94 g
d. 55.8 g
b. 27.0 g
e. 12.01 g
c. 40.1 g
f. 107.9 g
a. 1.000 mol
c. 1.57 x103 mol
b. 0.5000 mol
d. 2.81 x 10-13 mol
19.
39.95 amu
20.
10.01 amu
21.
a. 9.03 x 1023 atoms
b. 4.068 x 1024 atoms
c. 1.50 x 1023 atoms
23.
a. 3.10 x 1023 atoms
b. 1.51 x 1023 atoms
c. 2.31 x 1022 atoms
d. 7.871 x 1019 atoms
e. 3.06 x 1011 atoms
24.
a. 80.9 g
e. 413 g
b. 29.5 g
f. 8.25 x 109 g
c. 19.3 g
g. 3.50 x 10-4 g
d. 1590 g
28.
a. 1.00 mol
e. 0.0474 mol
b. 0.500 mol
f. 6.96 x 10-5 mol
c. 0.100 mol
g. 37.4 mol
d. 4.7 mol
h. 8.30 x 10-23 mol