Empirical Formula

Empirical Formulas

100

What is the empirical formula of C₂H₄?

CH₂

200

What is the empirical formula of C₆H₁₂O₆ if n = 6?

Answer: CH₂O

300

A compound contains 92.3% carbon and 7.7% hydrogen by mass. What is its empirical formula?

CH

Molar Mass

100

What is the molecular mass of H₂O?

Answer: 18.02 g/mol

200

What is the molecular mass of CO₂?

Answer: 44.01 g/mol

300

Find the molecular mass of a compound with the empirical formula CH₂ and a molecular formula of C₂H₄.

Answer: 28.06 g/mol

Find the Formula

100

100 Points: A compound has an empirical formula of CH₂ and a molecular mass of 28 g/mol. What is the molecular formula?

Answer: C₂H₄

200

A compound has an empirical formula of NH₂ and a molecular mass of 48 g/mol. What is the molecular formula?

N₃H₆

300

A compound has an empirical formula of C₆H₅ and a molecular mass of 154.20 g/mol. What is the molecular formula?

C₁₂H₁₀

Wildcard Chemistry

100

100 Points: What is Avogadro’s number?

Answer: 6.022 x 10²³

200

A compound has a molecular formula of H₂O. How many hydrogen atoms are in 3.40 mole of water?

2.05 x 10²⁴

300

300 Points: What is the mass of 1 mole of NaCl?

Answer: 58.44 g/mol