Empirical Formulas and Composition Quiz

What is the definition of an empirical formula in chemistry?

• The formula showing the actual number of atoms of each element in a molecule

• The formula showing the simplest whole-number ratio of atoms in a compound

• The formula showing the arrangement of atoms in a molecule

• The formula showing the mass of each element in a compound

• 11.19%

• 33.33%

• 88.81%

• 5.05%

Which of the following statements best describes the difference between an empirical formula and a molecular formula?

• Empirical formulas show the actual number of atoms; molecular formulas show the simplest ratio.

• Empirical formulas and molecular formulas are always the same.

• Empirical formulas show the simplest ratio; molecular formulas show the actual number of atoms.

• Empirical formulas show the arrangement of atoms; molecular formulas do not.

Which of the following is the correct empirical formula for a compound containing 40% sulfur and 60% oxygen by mass?

If a compound contains 27.3% carbon and 72.7% oxygen by mass, what is its empirical formula? (Atomic masses: C = 12, O = 16)

Tags

NGSS.HS-PS1-1

A sample contains 4.04 g of nitrogen and 11.46 g of oxygen. What is the empirical formula? (Atomic masses: N = 14, O = 16)

Tags

NGSS.HS-PS1-2

Which of the following compounds has the same empirical and molecular formula?