Empirical vs Molecular Formula Quiz

What does the molecular formula of a compound indicate?

• The ratio of atoms in the compound

• The color of the compound

• The exact number of each type of atom in the compound

• The physical state of the compound

Which of the following is the molecular formula for ethanol?

• C3H8O

• CH3OH

• C2H6O

• C2H5OH

What is the empirical formula of glucose?

• C3H6O3

• C2H4O2

• CH2O

• C6H12O6

Why might two different compounds have the same empirical formula?

• They have the same number of atoms

• They are in the same physical state

• They have the same ratio of atoms

• They have the same molecular weight

What is the significance of empirical formulas in analytical chemistry?

• They provide the exact number of atoms in a molecule

• They are used to identify unknown substances

• They help determine the physical properties of a compound

• They indicate the color of a compound

Which amino acid is identified by the empirical formula with 1 sulfur, 1 nitrogen, 2 oxygen, 5 carbon, and 11 hydrogen?

• Alanine

• Methionine

• Cysteine

• Glycine

What is the first step in finding the empirical formula from percent composition?

• Find the molecular weight

• Determine the physical state

• Convert the percentages to grams

• Identify the color

How do you convert grams to moles in empirical formula calculations?

• Divide by the atomic number

• Multiply by the atomic mass

• Divide by the atomic mass

• Multiply by the atomic number

What is the molecular formula of a diol with an empirical formula of CH3O?

• C5H12O5

• C4H10O4

• C3H8O3

• C2H6O2

What additional information is needed to find the molecular formula from the empirical formula?

• The color of the compound

• The physical state of the compound

• The boiling point of the compound

• The molar mass of the compound