Writing Empirical and Molecular Formulas

Determine the empirical formula for a compound that contains 35.98 g aluminum (Al) and 64.02 g sulfur (S).

• AlS

• Al₃S₂

• Al₂S₃

• Al₄S₆

Aspirin is the world’s most-often used medication. The chemical analysis of aspirin indicates that a 100 g sample of aspirin has 60.00 g carbon (C), 4.44 g hydrogen (H), and 35.56 g oxygen (O). What is the empirical formula of aspirin?

• CHO

• C₃H₅O

• C₁₈H₁₆O₈

• C₉H₈O₄

A colorless liquid sample composed of 46.68 g N, and 53.32 g O has a molar mass of 60.01 g/mol. What is the molecular formula of the compound?

• NO

• N₂O₂

• N₃O₃

• N₂O₃

Analysis of a chemical used in photographic developing fluid showed that it has 65.45 g C, 29.09 g O, and 5.45 g H. If the chemical’s molar mass is 110.0 g/mol, what is its molecular formula?

• CH₃O

• C₂H₂O

• C₆H₆O₂

• C₃H₆O₂

Tags

NGSS.HS-PS1-7

Determine the molecular formula of a compound with an empirical formula of NH₂ and a formula mass of 32.06 g/mol.

• NH

• NH₂

• N₂H₂

• N₂H₄