WorksheetsQuiz: Empirical and Molecular Formulas
Total questions: 25
Worksheet time: 47mins
A compound is found to contain 40.92% carbon, 4.58% hydrogen, and 54.50% oxygen. What is the empirical formula of the compound?
C4H8O2
C3H4O3
C2H4O
CO2H4
If a compound is found to contain 32.37% sodium, 22.58% sulfur, and 45.06% oxygen, what is its empirical formula?
Na2S2O5
Na2S2O3
Na2SO4
NaSO3
A compound is found to contain 70.0% iron and 30.0% oxygen. What is the empirical formula of the compound?
Fe2O3
Fe3O2
FeO
FeO2
If the empirical formula of a compound is CH2O and its molar mass is 90.08 g/mol, what is its molecular formula?
C3H6O3
C2H4O2
C4H8O4
CH4O4
The empirical formula of a compound is CH2 and its molar mass is 84.16 g/mol. What is the molecular formula of the compound?
CH4
C4H8
C6H12
C3H6
A compound has an empirical formula of NO2 and a molar mass of 92.02 g/mol. What is its molecular formula?
N2O2
NO3
N2O4
NO4
What is the percent by mass of oxygen in MgO, (MM= 40.31 g/mol)?
What is the empirical formula for C4H6?
CH
CH3
C2H3
C4H6
What is the empirical formula for N2S3?
NS
N3S2
N2S3
Which of the following compounds are both an empirical AND molecular formula (check all that apply)
C6H12O6
C12H22O11
H2O2
S2O4
H2O
Which of these is NOT an empirical formula?
CH2
C2H5
C6H4
C3H7
C5H17
A compound is found to be 38.7% Chlorine (Cl, 35.45 g/mol) and the rest oxgyen (O, 16.00 g/mol). What is the empirical formula of this compound?
Cl2O7
ClO
Cl2O3
None of these
How many Carbons "C" are in C18H34O3
18
34
3
37
How would you calculate the molar mass for C4H6?
12.01 + 1.01
4(12.01) + 6(1.01)
2(12.01) + 3(1.01)
6(12.01) + 4(1.01)
Empirical Formula = CF2
Molecular formula mass = 192 g/mol
Molecular Formula = ?
C4F8
C8F4
C3F6
C2F4
You are given 40.05g S and 59.95g O. Find the empirical formula for these elements.
SO
SO2
SO3
SO4
What is the empirical formula of K2SO4?
K2SO4
KSO2
K2SO2
KSO8
Succinic acid has an empirical formula of C2H3O2 and a molecular weight of 118 grams/mol. What is the molecular formula of succinic acid?
Atomic weights: C = 12.0, H = 1.01, O = 16.0
C6H12O6
C2H3O2
C3H6O3
C4H6O4
A compound has a molar mass of 170.0 g/mol and an empirical formula of SiF3. The compound's molecular formula is:
SiF3
Si5F15
Si2F6
Si4F12
When calculating the empirical formula the mole ratio is given as follows:
H1O3.5
What will the EF be?
H1O3.5
HO3.5
HO4
H2O7
Which of the following molecular formulas is correctly paired with its empirical formula?
C2H2 and CH3CH3
C6H6 and C2H2
P4O10 and P2O5
SO2 and SO3
