Empirical and Molecular Formulas

The video tutorial covers the concepts of empirical and molecular formulas, explaining their differences and providing examples such as acetylene, benzene, and ribose. It then demonstrates how to convert empirical formulas to molecular formulas using a formula box and provides sample problems for practice, including calculations for compounds like galactose and phosphorus oxide.

What is the empirical formula of acetylene?

• C6H6

• CH

• C4H8

• C2H2

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

• Acetylene

• Benzene

• Carbon Dioxide

• Ribose

What is the empirical formula of ribose?

• C3H6O3

• C2H4O2

• CH2O

• C5H10O5

How do you convert an empirical formula to a molecular formula?

• Multiply the empirical formula by the ratio of molecular mass to empirical mass

• Divide the molecular formula by the empirical mass

• Add the atomic masses of the elements

• Subtract the empirical mass from the molecular mass

What is the molecular formula if the empirical formula is CH2Cl and the molar mass is 99 g/mol?

• CH2Cl

• C4H8Cl4

• C2H4Cl2

• C3H6Cl3

What is the empirical formula of galactose?

• CH2O

• C6H12O6

• C2H4O2

• C3H6O3

If a compound has a molecular mass of 180 and an empirical formula of CH2O, what is its molecular formula?

• C4H8O4

• C3H6O3

• C2H4O2

• C6H12O6

What is the empirical formula of a compound with 21.82 g of phosphorus and 28.8 g of oxygen?

• P2O5

• P4O10

• PO2

• P3O6

How do you find the empirical formula from given masses of elements?

• Divide the largest mass by the smallest

• Convert masses to moles and find the simplest ratio

• Multiply the masses by the atomic number

• Add the masses together

What is the molecular formula of a compound with an empirical formula of P2O5 and a molecular mass of 283.15?

• P5O10

• P4O10

• P2O5

• P3O6