Empirical Formula Quiz

What does the empirical formula represent in a compound?

• The percentage composition of each element

• The total mass of the compound

• The simplest whole number ratio of elements

• The exact number of atoms in a molecule

In the context of empirical formulas, what is the significance of using 100g as a sample size?

• It makes the calculations more accurate

• It simplifies the conversion from grams to moles

• It is the standard sample size for all chemical calculations

• It allows the percentage to directly convert to grams

What is the first step in calculating an empirical formula from percentage composition?

• Convert percentage to grams

• Find the molecular formula

• Determine the atomic mass

• Convert grams to moles

How do you find the simplest whole number ratio in an empirical formula calculation?

• By using the molecular formula

• By multiplying the percentages by 100

• By dividing all mole values by the smallest mole value

• By adding the atomic masses

What is the empirical formula for a compound with 40.0% Carbon, 6.7% Hydrogen, and 53.3% Oxygen?

• C6H12O6

• C3H6O3

• CH2O

• C2H4O2

In the example of DDT, what was the final empirical formula derived?

• C14H9Cl5

• C2H5Cl

• C7H5Cl3

• C10H8Cl4

What is the relationship between empirical and molecular formulas?

• They have no relationship

• The empirical formula is a multiple of the molecular formula

• The molecular formula is a multiple of the empirical formula

• They are always identical

Which of the following is an example of a compound where the empirical formula is the same as the molecular formula?

• Glucose

• Water

• Formaldehyde

• Acetic acid

If the empirical formula of a compound is CH2O, what could be a possible molecular formula?

• CH4O

• C2H4O2

• C3H6O3

• C4H8O4

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