WorksheetsEmpirical and Molecular Formulas
Total questions: 10
Worksheet time: 34mins
Name
Class
Date
1.
What is the molecular formula if the empirical formula is CH2O and the molecular molar mass is 180.18?
a)
CH2O
b)
C2H4O2
c)
C4H8O4
d)
C6H12O6
2.
What is the molecular formula for a compound with the empirical formula: K2SO4 and a molecular mass of 696g.
a)
K2SO4
b)
K8SO16
c)
K8S4O8
d)
K8S4O16
3.
Glycerol has a molar mass of 92.09g/mol. Its percent composition is: 39.12% C, 8.75% H, and 51.12% O. What is the molecular formula for glycerol?
a)
C2H3O2
b)
CH2O
c)
C2H4O2
d)
C3H8O3
4.
Empirical Formula = CF2
Molecular formula mass = 192
Molecular Formula = ?
a)
C4F8
b)
C4F
c)
CF8
d)
C2F4
5.
Phenyl magnesium bromide is used as a reagent in organic synthesis. Determine its molecular formula if its molar mass is 181.31 g/mol and it contains 39.75% C, 2.78% H, 13.41% Mg, and 44.07% Br (these are in the correct order).
a)
C12H10Mg2Br2
b)
CHMgBr
c)
C6H5MgBr
d)
C3H2.5MgBr
6.
What is the molecular formula if the empirical formula is C2H5 and the molecular molar mass is 58.14 g/mol?
a)
C2H5
b)
C4H10
c)
C1H2.5
d)
C4H8
7.
What is the molecular formula of a compound with an empirical formula of C2OH4 and a molar mass of 88 grams per mole?
a)
C2O4H8
b)
C8O2H4
c)
C4O2H8
d)
C4O8H2
8.
What is the molecular formula for a compound with the empirical formula: CaCl2 and a molecular mass of 330g.
a)
Ca2Cl4
b)
Ca3Cl6
c)
Ca3Cl9
d)
Ca3Cl5
9.
What is the molecular formula for a compound with the empirical formula: CaCl2 and a molecular mass of 220g.
a)
Ca2Cl4
b)
Ca3Cl6
c)
Ca3Cl9
d)
Ca3Cl5
10.
The empirical formula of a substance is CH2O. The molar mass is 180g/mol. What is the molecular formula?
a)
CH2O
b)
C3H6O3
c)
C6H12O6
d)
C12H6O12
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