Empirical and Molecular Formula Practice
Chemistry practice with 20 problems: ten ask for an empirical formula from percent or mass composition, and ten ask for a molecular formula from an empirical formula and molar mass.
- Grades
- Grades 8–12, Middle School, High School
- File type
- Microsoft Word
- Subject
- Science, Chemistry
- Topic
- empirical formula, molecular formula
- Resource types
- Activities
About this resource
What's inside this resource
This resource includes 20 problems to practice empirical and molecular formula calculations.
The answers and solutions are included, though the document can be edited to meet your lesson's needs.
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In the classroom
Teaching tips & learning objectives
Learning objectives
- Calculate an empirical formula from percent or mass composition
- Determine a molecular formula from an empirical formula and molar mass
Teaching tips
- Students need atomic masses from a periodic table to work the mole-ratio and molar-mass steps.
Skills covered
- Mole ratios — converting composition data to the simplest whole-number ratio
- Molar mass reasoning — scaling an empirical formula up to the molecular formula
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Resource details
Concepts & topics
Core concepts
Core concepts
- Empirical formula
- Molecular formula
- Percent composition
- Molar mass
- Mole ratio
Topics
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