Chemistry Reference
In-Depth Information
Example 2
Determine the number of A. calcium atoms; B. nitrogen atoms;
and C. oxygen atoms, shown in the following: 6Ca(NO
3
)
2
A.
Each formula unit of calcium nitrate contains one atom of
calcium. So, 6 formula units of calcium nitrate contain 6 × 1,
or 6 atoms of calcium.
B.
Each formula unit of calcium nitrate contains two atoms of
nitrogen. So, 6 formula units of calcium nitrate contain 6 × 2,
or 12 atoms of nitrogen.
C.
Each formula unit of calcium nitrate contains six atoms of
oxygen. So, 6 formula units of calcium nitrate contain 6 × 6,
or 36 atoms of oxygen.
Lesson 5-6 Review
Base your answers to questions 1-5 on the following formula:
3Al
2
(CO
3
)
3
1.
How many total aluminum atoms are represented?
2.
How many total carbon atoms are represented?
3.
How many total oxygen atoms are represented?
4.
How many total atoms are represented?
5.
How many formula units are shown?
Base your answers to questions 6-10 on the following formula:
3C
6
H
12
O
6
6.
How many total atoms are represented?
7.
How many molecules are represented?
8.
How many carbon atoms are represented?
9.
How many hydrogen atoms are represented?
10. How many oxygen atoms are represented?
