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 9

A 100 g sample of a compound contains 40 g of sulfur and 60 g of oxygen. What is the percent composition of oxygen?

A 200 g sample of a compound contains 80 g of oxygen. What is the percent composition of oxygen?

A 50 g sample of a compound contains 10 g of hydrogen. What is the percent composition of hydrogen?

A compound contains 12 g of carbon, 2 g of hydrogen, and 16 g of oxygen. What is the percent composition of hydrogen?

A compound contains 24 g of carbon and 64 g of oxygen. What is the percent composition of carbon in the compound?

A compound has a molar mass of 100 g/mol and contains 20 g of hydrogen per mole. What is the percent composition of hydrogen?

A compound has a percent composition of 52.2% carbon, 13.0% hydrogen, and 34.8% oxygen. What is the empirical formula?

A sample of NaCl has a mass of 58.5 g. What is the percent by mass of sodium in NaCl? (Na = 23, Cl = 35.5)

Calculate the percent composition of carbon in C₆H₁₂O₆. (C = 12, H = 1, O = 16)

Calculate the percent composition of chlorine in CaCl₂. (Ca = 40, Cl = 35.5)

Calculate the percent composition of hydrogen in H₂O. (Atomic masses: H = 1, O = 16)

Calculate the percent composition of magnesium in MgCl₂. (Mg = 24, Cl = 35.5)

Calculate the percent composition of nitrogen in NH₃. (N = 14, H = 1)

Calculate the percent composition of oxygen in Al₂O₃. (Al = 27, O = 16)

Calculate the percent composition of potassium in KNO₃. (K = 39, N = 14, O = 16)

Calculate the percent composition of sulfur in H₂SO₄. (H = 1, S = 32, O = 16)

If a compound has a percent composition of 40% carbon, 6.7% hydrogen, and 53.3% oxygen, what is its empirical formula?

What is meant by percent composition in chemistry?

Which element has the highest percent composition in H₂SO₄? (H = 1, S = 32, O = 16)

A 120 g sample of a compound contains 24 g of hydrogen and the rest is carbon. What is the percent composition of carbon in the compound?