1.24 calculate empirical and molecular formulae from experimental data

EMPIRICAL FORMULA:

- It is the smallest whole number ratio of atoms in a compound.

- 1. Write all the elements in compound.
- 2. Write their masses / percentages from the question.
- 3. Divide them by relative atomic mass.
- 4. Multiply or divide each number to get a whole number.
- 5. Obtain ratio in simplest form and write into formulae.

MOLECULAR FORMULAE:

- It is the exact value of atoms of each element in a single molecule.
- They are whole number multiples of empirical formulae.

- 1. Find the mass of empirical formulae.
- 2. That gives you how many empirical units are in the molecule.
- 3. Therefore you do the given empirical formulae x empirical units.