Empirical and Molecular Formula

Front

What is an empirical formula?

Back

An empirical formula is the simplest whole-number ratio of elements in a compound.

Front

What is a molecular formula?

Back

A molecular formula shows the actual number of atoms of each element in a molecule of a compound.

Front

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

Back

Divide the subscripts in the molecular formula by their greatest common divisor.

Front

What is the empirical formula for C₆H₁₂?

Back

C₁H₂.

Front

If a compound has a molecular formula of C₄H₈, what is its empirical formula?

Back

C₂H₄.

Front

What is the empirical formula for N₂S₃?

Back

N₂S₃.

Front

How do you find the empirical formula from mass data?

Back

Convert the mass of each element to moles, then find the simplest mole ratio.

Front

What is the empirical formula for 40.05g S and 59.95g O?

Back

SO₃.

Front

What is the relationship between empirical and molecular formulas?

Back

The molecular formula is a whole-number multiple of the empirical formula.

Front

If the empirical formula is CF₂ and the molecular mass is 192 g/mol, what is the molecular formula?

Back

C₄F₈.