Chemistry Reference
In-Depth Information
7.
[188 u]—Work shown here:
Cu = 63.5 u/atom × 1 atom =
63.5 u
N = 14.0 u/atom × 2 atom =
28.0 u
O = 16.0 u/atom × 6 atoms =
+ 96.0 u
Total =
188 u
8.
[68.2 u]—Work shown here:
N = 14.0 u/atom × 2 atom =
28.0 u
H = 1.01 u/atom × 8 atom =
8.08 u
S = 32.1 u/atom × 1 atoms =
+ 32.1 u
Total =
68.2 u
9.
[28.0 u]—Work shown here:
C = 12.0 u/atom × 1 atom =
12.0 u
O = 16.0 u/atom × 1 atoms =
+ 16.0 u
Total =
28.0 u
10. [46.0 u]—Work shown here:
N = 14.0 u/atom × 1 atom =
14.0 u
O = 16.0 u/atom × 2 atoms =
+ 32.0 u
Total =
46.0 u
Lesson 5-6 Review
1.
[6]—Each formula unit of Al
2
(CO
3
)
3
contains 2 atoms of aluminum, so 3
formula units contains 3 × 2, or 6 atoms of aluminum.
2.
[9]—Each formula unit of Al
2
(CO
3
)
3
contains 3 atoms of carbon, so 3
formula units contains 3 × 3, or 9 atoms of carbon.
3.
[27]—Each formula unit of Al
2
(CO
3
)
3
contains 9 atoms of oxygen, so 3
formula units contains 3 × 9, or 27 atoms of oxygen.
4.
[42]—Each formula unit of Al
2
(CO
3
)
3
contains a total of 14 atoms, so 3
formula units contains 3 × 14, or 42 atoms in total.
5.
[3]—The number of formula units is indicated by the coefficient of 3 at the
beginning of the expression, 3Al
2
(CO
3
)
3
.
6.
[72]—Each molecule of C
6
H
12
O
6
contains a total of 24 atoms, so 3
molecules contain 72 atoms.
7.
[3]—The number of molecules is indicated by the coefficient of 3 at the
beginning of the expression, 3C
6
H
12
O
6
.
8.
[18]—Each molecule of C
6
H
12
O
6
contains 6 carbon atoms, so 3 molecules
contain 3 x 6, or 18 carbon atoms.
