Empirical Formulas 4
1. The action of bacteria on meat and fish produces a poisonous compound called
cadaverine. As its name and origin imply, it stinks. It is 58.77% carbon, 13.81%
hydrogen, and 27.43% Nitrogen. Its molar mass is 102.2 g/mol. Determine the
molecular and empirical formulas of the compound.
2. Vanillin is a common flavoring agent. It has a molar mass of 152 g/mol and is
63.15 % C, 5.30%H, and the remainder is oxygen. Determine the molecular and
empirical formulas of vanillin.
3. Fluorocarbonyl hypofluorite was recently isolated and analysis showed it to be
14.6% C, 39.0% O, and 46.3% F. If it has a molar mass of 82 g/mol, what is the
empirical and molecular formulas of the compound?
4. Naphthalene, best known in the form of moth balls, is composed of 93.71%
Carbon and 6.29% Hydrogen. If the molar mass is 128 g/mol, what are the
empirical and molecular formulas of Naphthalene?
5. A major oil company has used a gasoline additive called MMT to boost the octane
rating of its gasoline. What is the empirical formula of MMT if it is 49.6% C,
3.20% H, 22.0% O, and 25.2% Mn.
6. A sample of a compound between tin and chlorine with a mass of 2.571 g was
found to contain 1.171 g of tin. What is the empirical formula?
7. A 1.5246 g sample of a compound between nitrogen and oxygen contains 0.7117
g of nitrogen. Calculate the empirical formula.
8. A 0.5438 g sample of a liquid consisting of only C, H, and O was burned in pure
oxygen, and 1.039 g of CO2 and 0.6369 g of H2O were obtained. What is the
empirical formula of the compound?
9. The combustion of 5.048 g of a compound of C, H, and O gave 7.406 g CO2 and
3.027 g H2O. Calculate the empirical formula of the compound.
10. A 0.3148 g sample of a compound between phosphorus and oxygen was found to
contain 0.1774 g P. What is its empirical formula?
11. A sample with a mass of 0.3886 g of a compound of mercury and bromine was
found to contain 0.1107 g bromine. Its molecular mass was found to be 561
g/mol. What are its empirical and molecular formulas?
12. A 0.6662 g sample of antimonal saffron was found to contain 0.4017 g of
antimony. The remainder was sulfur. The molecular weight of this compound is
404 g/mol. What are the empirical and molecular formulas of this compound?
13. A 0.1246 g sample of a compound of chromium and chlorine was dissolved in
water. All of the chloride ion was then captured by silver ion in the form of
AgCl. A mass of 0.3383 g of AgCl was obtained. Calculate the empirical
formula of the compound containing only Cr and Cl.
14. When 6.853 g of a hydrocarbon containing C, H, and O was burned, 19.73 g of
CO2 and 6.391g of H2O was captured. The molecular weight is found to be 290
g/mol. Calculate the empirical and molecular formulas of this compound.
15. When a sample of a compound in the vitamin D family composed of Carbon,
Hydrogen, and Oxygen with a molecular weight of 412 g/mol was burned in a
combustion analysis, 2 g of the compound gave 5.9715 g of CO2 and 1.9211 g of
H2O. What are the molecular and empirical formulas of this compound? (You
can round this one off to a whole number without multiplying)