12.1
STUDY GUIDE Counting Particles of Matter
CIRCLE the letter of the
word or phrase that best completes the statement or answers the question.
1. Which
of the following quantities is not a mole of the substance?
a. 15.999
g oxygen gas
b. 12.011
g carbon
c. 28.014
g nitrogen gas
d. 4.003
g helium gas
2. The
mass of a mole of zinc equals the atomic mass of zinc expressed in:
a. mol
b. kilograms
c. grams
d. number
of particles
3. The
number of atoms in one mole of sodium metal is:
a. 23
b. 6.02
X 1023
c. 23
÷ (6.02 X 1023)
d. (6.02
X 1023) ÷ 23
4. The
term molecular mass is used only for compounds:
a. containing
carbon
b. consisting
of ions
c. that
are covalent
d. that
do not ionize in water
5. A
sample of water whose mass is 18 g represents what quantity of water?
a. formula
mass
b. molar
mass
c. atomic
weight
d. atomic
mass
6. The
formula mass for aluminum chloride is:
a. 62.45
u
b. 6.02
3 1023 u
c. 97.9
u
d. 133.34
u
7. Compared
to the number of molecules in a mole of hydrogen gas (H2), the
number of molecules in a mole of water (H2O) is:
a. twice
as many
b. the
same
c. half
as many
d. three
times as many
8. The mass of an
average ruthenium atom is 8.4 times as large as the mass of an average carbon
atom. What is the mass of one mole of ruthenium?
a. 8.4 g
b. 8.4 X 6.02 X
1023 g
c. 100.9 g
d. 8.4 X 12 X
6.02 X 1023 g
9. The mass of
one molecule of ammonia is its .
a. molecular
weight
b. molecular mass
c. formula mass
Solve the following problems.
10. Find the
number of atoms in each of the following measurements.
a. 10.0 g of Al
b. 25.9 g of F
11. Find the molar
mass of each of the following compounds.
a. N2O5
b. ammonium
carbonate
12. Express each
of the following in grams.
a. 0.147 mol of
NH4NO3
b. 2.60 mol of
lithium bromide
13. Convert each
of the following to its equivalent in moles.
a. 17.1 g of H2S
b. 2.50 g of
copper(II) chloride
Answer the following questions.
14. How many
nitrogen atoms are in 1⁄4 mole of nitrogen gas?
15. How many moles
of oxygen atoms are in 1⁄2 mole of NaIO4?