There are five basic laws that govern the chemical combination of elements. They are as follows:
Law of Conservation of Mass
It states that during a chemical reaction, the mass of the products and reactants will always be equal.
Law of Definite Proportions
It states that every chemical compound will contain a fixed and constant proportion by mass, of its constituent elements. Joseph Proust proposed this law.
Law of Multiple Proportions
It is a rule of stoichiometry formulated by John Dalton.
Gay Lussac’s Law of Gaseous Volumes
Gay Lussac gave this law in the year 1808. This law was properly explained by Avogadro.
Avogadro Law
It states that when the temperature and pressure conditions are same, gases of equal volumes contain the same number of molecules.