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 10

A 10 g sample of a compound contains 4 g of nitrogen. What is the percent composition of nitrogen in the compound?

A 50 g sample of a compound contains 20 g of element X. What is the percent composition of X?

A compound contains 24 g of magnesium and 16 g of oxygen. What is the percent composition of magnesium?

A compound is found to contain 70% iron and 30% oxygen by mass. What is the empirical formula? (Atomic masses: Fe = 56, O = 16)

A sample of magnesium oxide (MgO) has a mass of 40 g. If magnesium's atomic mass is 24 and oxygen's is 16, what is the percent composition of magnesium in MgO?

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

Calculate the percent composition of nitrogen in NH₄NO₃. (Atomic masses: N = 14, H = 1, O = 16)

Calculate the percent composition of oxygen in CaCO₃. (Atomic masses: Ca = 40, C = 12, O = 16)

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

Calculate the percent composition of sulfur in H₂SO₄. (Atomic masses: 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 the empirical formula?

What is meant by percent composition in chemistry?

Which of the following best describes the steps to calculate percent composition? (1) Find the molar mass of the compound. (2) Divide the mass of each element by the molar mass. (3) Multiply by 100. (4) Add the atomic numbers of each element.