Name: ______________________________
Date: _____________________
28 Homework: Molecular Formula
1. The molar mass of a compound is approximately 46 g/mol, and it has an empirical formula of
C2H8N. What is its molecular formula?
2. A compound has an empirical formula of CH2Cl and a molecular weight of 98.96 g/mol. What
is its molecular formula?
3. A compound has an empirical formula of C2H5 and a molar mass of about 58 grams. What is
its molecular formula?
4. Dimethylglyoxime is a compound whose molar mass is 116.1 grams/mole. The empirical
formula of this compound is C2H4NO. What is its molecular formula?
5. A compound is determined to have an empirical formula of CFBrO. The molecular formula of
the compound is known to be 254.7 g/mol. What is the molecular formula of the compound?
6. Vitamin C is an important nutrient. It has an empirical formula of C3H4O3 and a molar mass
of 176 grams. What is the molecular formula of vitamin C?
7. What is the molecular formula of a compound with a molar mass of 90.0 g/mol and an
empirical formula of CH2O?
8. What is the molecular formula of a compound with an empirical formula of CH 2 and a
molecular mass of 42 grams/mole?
Determine the empirical formula from the information given, and then use the molecular
mass to determine the molecular formula of the compound.
1. A sample of a compound is determined to have 10.51 g of C and 1.75 g of H. The molar mass
of the compound is 28 g/mol. What is the molecular formula for this compound?
______________________________________________________________________________
______________________________________________________________________________
Empirical Formula = ________________
Molecular mass: ______________
Empirical mass: ______________
Factor: _____
Molecular Formula: __________________
2. Analysis of a compound shows that it is 54.53% carbon, 9.15% hydrogen, and 36.32% oxygen.
It has a molecular mass of 132.16 g/mol. What is its molecular formula?
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________
Empirical Formula = ________________
Molecular mass: ______________
Empirical mass: ______________
Factor: _____
Molecular Formula: __________________
3. A compound is 75.46% carbon, 4.43% hydrogen, and 20.10% oxygen by mass. It has a
molecular weight of 318.31 g/mol. What is the molecular formula for this compound?
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______________________________________________________________________________
______________________________________________________________________________
Empirical Formula = ________________
Molecular mass: ______________
Empirical mass: ______________
Molecular Formula: __________________
Factor: _____