Percent Composition Calculations

Chemistry ⇒ Stoichiometry and Chemical Calculations

Percent Composition Calculations starts at 9 and continues till grade 12. QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Percent Composition Calculations. How you perform is determined by your score and the time you take. When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.

See sample questions for grade 11

A 10.0 g sample of a compound contains 2.0 g of hydrogen. What is the percent by mass of hydrogen in the compound?

A 25.0 g sample of a compound contains 10.0 g of oxygen. What is the percent by mass of oxygen in the compound?

A compound contains 24.3% magnesium, 27.0% phosphorus, and 48.7% oxygen by mass. What is the empirical formula of the compound?

A compound has a molar mass of 180 g/mol and contains 72 g of carbon per mole. What is the percent composition of carbon?

A sample of NaCl has a mass of 58.44 g. What is the percent by mass of sodium in NaCl?

Calculate the percent by mass of iron in Fe₂O₃.

Calculate the percent composition of carbon in CO₂.

Calculate the percent composition of each element in Al₂(SO₄)₃.

Calculate the percent composition of each element in CaCO₃.

Calculate the percent composition of hydrogen in C₂H₆.

Calculate the percent composition of nitrogen in NH₃.

Describe how percent composition can be used to determine the empirical formula of a compound.

Explain the steps involved in calculating the percent composition of an element in a compound.

What is the percent composition by mass of hydrogen in H₂O?