Mole Problems
Empirical Formulas
Molecular Formulas
Percent Composition
Molar Mass
100

Determine the number of moles of CO2 in 454 grams of CO2.

10.3 Mol

100

You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements.

SO3

100

Styrene has the empirical formula CH, and there is 92.25% carbon and 7.75% hydrogen. If you have a molar mass of 104g/mol, what is the multiplier or factor to get the molecular formula?

C

100

What is the percentage of oxygen in carbon dioxide? (CO2)

72.7%

100

What is the molar mass of sucrose? (C12H22O11)

342g

200

Find the number of grams in 0.700 moles of hydrogen peroxide H2O2.

23.811 grams

200

What is the empirical formula if you have 81.82% carbon and 18.18% hydrogen?

C3H8

200

What is the molecular formula for styrene?

C8H8

200

What is the percentage of chlorine in sodium chloride? (NaCl)

60.7%

200

What is the molar mass of sulfuric acid? (H2SO4)

98g

300

Determine the mass in grams of 3.60 mol of H2SO4.

353 g H2SO4

300

Given the following: 42.07% Na, 18.89% P, and 39.04% O, determine the empirical formula.

Na3PO4

300

Analysis of ibuprofen yields a molar mass of 206g/mol, and the following composition: 75.7%C, 8.80%H, and 15.5% O. What is the molecular formula of ibuprofen?

C13H18O2

300

What is the percentage of carbon in sucrose?

42.1%

300

What is the molar mass of silver nitrate? (AgNO3)

170 g

400

How many moles are in 25.5g of silver?

0.24 Mol

400

What is the empirical formula if you have 36.84% nitrogen and 63.16% oxygen?

N2O3

400

True or false? The molecular formula for ibuprofen is the same as the empirical formula.

True
400

What is the percentage of oxygen in sucrose?

51.5%

400

What is the molar mass of carbon dioxide? (CO2)

44g

500

Approximately how many moles are in 300g of sulfur?

10 Mol

500

What is the empirical formula if you have 35.98% aluminum and 64.02% sulfur?

Al2S3

500

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?

C3H8O3

500

What is the percentage of iron in iron(III)oxide?

70%

500

What is the molar mass of hydrochloric acid? (HCl)

36g