# General Formula

## Contents

## Key Stage 4

### Meaning

A **general formula** is a way to represent the the ratio of atoms in a homologous series.

### About General Fromulae

**General formulae**allow Chemists to predict the number of one type of atom in a compound using the number of another atom.

The **general formulae** you should know:

- Alkanes - C
_{n}H_{2n+2} - Alkenes - C
_{n}H_{2n} - Alcohols - C
_{n}H_{2n+2}O - Carboxylic Acids - C
_{n}H_{2n}O_{2}