Molecular Formulas

Molecular Formulas

By K. Witt

Multiple Choice

What is the next step to solving our equation?

• Use the numbers as subscripts to create the empirical formula.

• Determine the empirical formula mass.

• Multiply the numbers by the molar masses to get the empirical formula mass.

• Put my head in my hands and cry.

Multiple Choice

What does the 81.13 represent?

• The molecular formula mass.

• The empirical formula mass.

• The gram molecular mass.

• Are you kidding?! I don't know!!!

Multiple Choice

What are we going to do with the result of the calculation?

• Multiply it through the molecular formula to determine the empirical formula.

• Multiply it by the 243.39 g to determine the molecular formula.

• Multiply it through the empirical formula to determine the molecular formula.

• Please stop asking me questions, I don't know!

Multiple Choice

What should be our first step?

• Divide each element by its molar mass.

• Multiply each element by its molar mass.

• Determine the molecular formula mass.

• Determine the empirical formula mass.

Fill in the Blank

So what is the molecular formula?

Note: the subscripts will appear as normal numbers.