1. The Molecular and Empirical Formula Game
Can you find the molecular or empirical formula?

2. Question 1
A compound has an empirical formula of ClCH2 and its molar mass is g/mol. What is the molecular formula of this compound?
Cl2C2H4

3. Question 2
A compound consists of 75.0% magnesium and 25.0% oxygen. What is the empirical formula?
Mg2O

4. Question 3
A compound has the following percent composition: 49.48% carbon, 5.19% hydrogen, % oxygen, and 28.85% nitrogen. What is the empirical formula?
C4H5ON2

5. Question 4
C4H5ON2 has a molar mass of g/mol. What is its molecular formula
C8H10O2N4

6. Question 5
A compound is found to have 46.67% nitrogen, % hydrogen, 19.98% carbon, and 26.65% oxygen. What is its empirical formula?
N2H4CO

7. Question 6
Find the empirical formula of a compound that contains 15.8 g of Al, 28.1 g of S, and 56.1 g of oxygen.
Al2S3O12 or Al2(SO4)3

8. Question 7
Benzoic acid contains 68.8% carbon, 4.95% hydrogen, and 26.25% oxygen. Find the empirical formula
C7H6O2

9. Question 8
Benzoic acid contains 68.8% carbon, 4.95% hydrogen, and 26.25% oxygen. Find the empirical formula
C7H6O2

10. Question 9
A compound contains 50.0% magnesium, % carbon, 16.0% oxygen, and 10.0% hydrogen. What is the empirical formula?
Mg2C2OH10

11. Question 10
A compound contains 75.46% carbon, 4.43% hydrogen, and 20.11% oxygen. It has a molar mass of g/mol. What is the empirical and molecular formula?
EF: C10H7O2
MF: C20H14O4

12. Question 12
Freons are gaseous compounds used in refrigeration. A particular Freon contains % carbon, 58.64% chlorine, and 31.43% fluorine. What is the empirical formula
CCl2F2

13. Question 12
A compound with an empirical formula of CH is found to have a molar mass of g/mol. What is its molecular formula?
C2H2

14. Question 13
A compound consists of 40.0% calcium, % carbon, and 48.0% oxygen. What is the empirical formula?
CaCO3

15. Question 14
The empirical formula for a hydrocarbon is CH2. Its actual molar mass is 294 g/mol. What is its molecular formula?
C21H42

16. Question 15
A compound consists of 85.0% silver and % fluorine. What is the empirical formula?
AgF