Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What is the empirical formula?
💡 Hint: Think of it as the reduced form of the chemical formula.
Question 2
Easy
What does the molecular formula tell us?
💡 Hint: It's a complete version, unlike the empirical one.
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Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
What is the ratio of elements in an empirical formula?
- Actual number of atoms
- Simplest whole number ratio
- Mass of elements
💡 Hint: Think of it as a simplified version of a chemical formula.
Question 2
True or False: The molecular formula can be exactly the same as the empirical formula.
- True
- False
💡 Hint: Consider compounds where elements have the same ratios.
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Challenge Problems
Push your limits with challenges.
Question 1
A compound is found to contain 35.0% Carbon, 7.0% Hydrogen, and 58.0% Oxygen by mass. Calculate both the empirical and molecular formulas given the molar mass is 180 g/mol.
💡 Hint: Convert mass percentages to moles, find ratios, then apply molar mass.
Question 2
Given a compound composed of 10.0 g of Nitrogen and 30.0 g of Oxygen, find the empirical and molecular formulas given its molar mass of 90 g/mol.
💡 Hint: Use the masses to find moles, then ratios to find empirical, followed by molar mass for molecular.
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