4. Stoichiometry
Percent Composition — Quiz
Test your understanding of percent composition with 5 practice questions.
Practice Questions
Question 1
What is the percent composition of oxygen in potassium permanganate (KMnO₄)?
Question 2
A compound is found to contain 20.0% magnesium, 26.7% sulfur, and 53.3% oxygen by mass. What is its empirical formula?
Question 3
What is the percent composition of chlorine in aluminum chloride (AlCl₃)?
Question 4
A compound contains 50.0% sulfur and 50.0% oxygen by mass. What is its empirical formula?
Question 5
What is the percent composition of carbon in calcium carbonate (CaCO₃)?