Empirical and Molecular Formulas Quiz

What does the empirical formula represent in a compound?

• The total mass of the compound

• The relative number of atoms of each element

• The type of chemical bonds present

• The absolute number of atoms of each element

If a compound has a molecular formula of C6H6, what is its empirical formula?

• C6H6

• C2H2

• CH

• C3H3

Which of the following molecular formulas can have the empirical formula CH?

• C2H2

• C4H4

• C8H8

• C5H5

What is the empirical formula of S8?

• S

• S8

• S4

• S2

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

• C6H12O6

• H2O

• C3H6

• C2H4

What is the empirical formula of carbon monoxide?

• CO2

• C2O

• CO

• C2O2

How do you determine the empirical formula from a molecular formula?

• By finding the greatest common factor of the subscripts

• By multiplying the subscripts by a constant

• By adding the subscripts of each element

• By subtracting the smallest subscript from the others

What is the greatest common factor of the subscripts in C12H24O2?

• 24

• 12

• 8

• 6

What is the empirical formula of C12H24O2?

• C6H12O

• C2H4O

• C3H6O

• CH2O

Why can't the empirical formula alone determine the molecular formula?

• It lacks information about the total number of atoms

• It doesn't specify the molecular weight

• It only provides the relative number of atoms

• It doesn't include the type of chemical bonds