# Calculating Percent Composition and Determining Empirical Formulas

Instructions:

question 1 of 3

### What is the empirical formula of a compound containing 36.5% sulfur and 63.5% iron?

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### 2. What is the percent composition of Cu₂S?

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This quiz and corresponding worksheet will help you gauge your understanding of how to calculate percent composition and determine empirical formulas. Topics you'll need to know to pass the quiz include understanding how to find the empirical formula from a given composition of compounds as well as knowing all the elements needed in finding an empirical compound.

## Quiz & Worksheet Goals

Use these assessment tools to assess your knowledge of:

• How to find the empirical formula from a given composition of compounds
• All the elements needed in finding an empirical compound
• Finding the percent composition of an empirical compound
• What the empirical compound shows
• The contrasts with a chemical formula

## Skills Practiced

This worksheet and quiz will let you practice the following skills:

• Defining key concepts - ensure that you can accurately define main phrases, such as empirical formula
• Reading comprehension - ensure that you draw the most important information from the related how to calculate percent composition and determine empirical formulas lesson
• Interpreting information - verify that you can read information regarding how to calculate percent composition and determine empirical formulas and interpret it correctly
• Knowledge application - use your knowledge to answer questions about how to calculate percent composition and determine empirical formulas

To learn more about the kinds and proportions of atoms in a substance in its simplest form, review the corresponding lesson Calculating Percent Composition and Determining Empirical Formulas. This lesson covers the following objectives:

• Describe the idea behind chemical formula
• Identify how to find the empirical formula from a given composition of compounds
• Know all the elements needed in finding an empirical compound
• Learn how to find the percent composition of an empirical compound
• Appreciate what the empirical compound shows
• Understand the contrasts with a chemical formula
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