Name: ________________________ Class: ___________________ Date: __________
Empirical and Molecular Formulas
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____
1. Which of the following compounds have the same empirical formula?
a. CO 2 and SO 2
c. C 4 H 10 and C 10 H 4
b.
____
C 6 H 12 and C 6 H 14
SO 2
d.
S6 O4
3. What is the empirical formula of a substance that is 53.5% C, 15.5% H, and 31.1% N by weight?
a. C 3 HN 2
c. C 2 H 8 N
b.
____
d.
2. What is the empirical formula of a compound that is 40% sulfur and 60% oxygen by weight?
a. SO
c. SO 3
b.
____
C 7 H 14 and C 10 H 20
C 4 H 14 N 2
d.
CH 4 N 7
4. Which of the following sets of empirical formula, molar mass, and molecular formula is correct?
a. CH, 78 g, C 13 H 13
c. CaO, 56 g, Ca 2 O 2
b.
CH 4 N, 90 g, C 3 H 12 N 3
d.
1
C 3 H 8 O, 120 g, C 3 H 8 O 2
ID: A
ID: A
Empirical and Molecular Formulas
Answer Section
MULTIPLE CHOICE
1. ANS:
OBJ:
2. ANS:
OBJ:
3. ANS:
OBJ:
4. ANS:
OBJ:
B
10.3.2
C
10.3.2
C
10.3.2
B
10.3.3
PTS: 1
DIF:
L1
REF: p. 309
PTS: 1
DIF:
L2
REF: p. 310
PTS: 1
DIF:
L2
REF: p. 310
PTS: 1
DIF:
L2
REF: p. 312
1