Lesson: Empirical and Molecular Formulas

In this lesson, we will learn how to define and convert between the empirical, molecular, and structural formulas of a compound.

Worksheet: 8 Questions

Q1:

A compound containing only tungsten and chlorine is reduced with hydrogen to produce hydrogen chloride gas and 0.2232 g of tungsten metal. Complete reaction of the hydrogen chloride in water requires 46.2 mL of a 0.1051 M sodium hydroxide solution. Determine the empirical formula of the unknown compound.

Q2:

A compound composed of boron and hydrogen has a molar mass of approximately 28 g/mol. A sample of the compound weighing 25.0 mg burns in air to produce 63.0 mg of boron oxide ().

What is the empirical formula of this compound?

What is the molecular formula of this compound?

Q3:

Caffeine has the chemical formula . What is its empirical formula?

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