C9 Empirical Formula

Question 1

Mole formula

Answer 1

Moles (mol) = mass (g) / formula or atomic mass

Question 2

Molecular Formula

Answer 2

The number and type of all the atoms in the molecule.

Question 3

Empirical Formula

Answer 3

The simplest whole number ratio of types of atom in a molecule.

Question 4

Empirical formula steps

Answer 4

1. Mass or %
2. Atomic Mass
3. Divide mass by atomic mass
4. Divide both by the smallest
5. Answer

Question 5

A compound contains 25% hydrogen and 75% carbon, what is the empirical formula?

Answer 5

Hydrogen Carbon

1. Mass or %. 25 % 75%
2. Atomic mass 1 12
3. Moles 25/ 1 = 25 mol 75 / 12 = 6.25
4. / by smallest 25/6.25 = 4 6.25/ 6.25 = 1
5. Answer CH4