WorksheetsEmpirical & Molecular
Total questions: 27
Worksheet time: 2hrs 57mins
What is the empirical formula for N2S3?
NS
N3S2
N2S3
N1S1.5
What is the empirical formula for C4H6?
CH
CH3
C2H3
C4H6
Which pair has the same empirical formula?
NaCrO4 and Na2Cr2O7
C2H4O2 and C6H12O6
C3H6O3 and C2H6O2
CH4 and C2H6
You are given 40.05g S and 59.95g O. Find the empirical formula for these elements.
SO
SO2
SO3
SO4
Given the following: 42.07g Na, 18.89g P, and 39.04g O, determine the empirical formula.
NaPO2
Na2PO3
Na3PO4
NaPO4
A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?
Mg4N3
MgN2
Mg3N2
MgN
What is the empirical formula if you have 81.82% carbon and 18.18% hydrogen?
C3H8
CH3
C2H2
C4H10
What is the molecular formula for a compound with the empirical formula: K2SO4 and a molecular mass of 696g.
K2SO4
K8SO16
K8S4O8
K8S4O16
What is the molecular formula if the empirical formula is CH2O and the molecular molar mass is 180.18?
CH2O
C2H4O2
C4H8O4
C6H12O6
What is the empirical formula if you have 81.82% carbon and 18.18% hydrogen?
C3H8
CH4
C2H2
C4H10
Molecular Formula = Si2F6
Choose the correct empirical formula.
SiF
Si2F6
SiF3
Si4F12
Molecular Formula = C2F6
Choose the correct empirical formula.
CF
C2F6
C3F
CF3
A compound is made up of 40% calcium(Ca) and 60% chlorine(Cl) by mass. What is the empirical formula of the compound?
CaCl
CaCl2
Ca2Cl
Ca2Cl3
What is the percent composition by mass of carbon in carbon dioxide ( CO2 )?
27.3%
42.9%
57.1%
72.7%
If a compound sample contains 40g of calcium, 12g of carbon, and 48g of oxygen, what is the percent composition by mass of calcium?
40%
50%
60%
70%
What is the percent composition by mass of oxygen in water ( H2O )?
11%
89%
67%
33%
A compound contains 24g of carbon, 4g of hydrogen, and 32g of oxygen. What is the percent composition by mass of hydrogen?
4%
7%
12%
14%
If a sample has a mass of 58.5 grams and is composed of 39.3 g of Na, 18.6 g of C, and 0.6 g of H, what is the percent composition by mass of carbon?
31.8%
33.3%
35.7%
37.6%
What is the empirical formula for the following:
Pb5Cr5O20
Pb2Cr2O10
PbCr2O7
Pb9Cr4O2
PbCrO4
What is the molecular formula if the empirical formula is CH2O and the molecular molar mass is 180.18?
(C = 12.01 g/mol, H = 1.01 g/mol, O = 16.00 g/mol)
CH2O
C2H4O2
C4H8O4
C6H12O6
What is the percent composition of Benzene, C6H6?
C = 50%
H = 50%
C = 85.7 %
H = 14.3%
C = 92.2%
H = 7.8%
C = 71.9%
H = 28.1%
If you have 250g of Carbon Dioxide (CO2) how many grams of Carbon would you have?
136.5 g
68.3 g
27.3g
181.7g
Find the empirical formula of a compound that is 53.7% iron and 46.3% sulfur.
FeS
Fe2S3
Fe4 S6
The molar mass of a compound is 92 g/mol. Analysis of the sample indicates that it contains 0.606 g N and 1.390 g O. Find the compound’s molecular formula.
NO
NO2
N2O4
What has greatest amount of Fe? FeCl2 or FeI2
FeI2
FeCl2
Same amount
Which compound contains more moles of Fe per mole of compound? Fe2O3 or Fe3O4
Fe2O3
Fe3O4
Both contain the same
