Law of Definite Proportions
Law of Definite Proportions which is also known as the Law of Constant Composition, states that in any given chemical compound the composition of the element by mass is always remains the same.
In other words, this means that the ratio of the mass of the elements in the chemical compounds always remains the same i.e., in a water molecule there will always be two hydrogens and one oxygen molecule. The law of Definite proportion is first proposed by Joseph Louis Proust in the late 18th century and many scholars have proved it since then. This law helps us identify between different chemical compounds as well.
Example of Law of Definite Proportions
Consider the different molecules of Oxides of Nitrogen for examples of the law of definite proportions.
In the above example of oxides of Nitrogen if we take any amount of Oxygen and Nitrogen in the sample then the ratio of nitrogen to oxygen in the formed NO will always be 1:1. Similarly, the ratio of nitrogen to oxygen for NO2, N2O, and N2O2 will be 1:2, 2:1 and 2:2 respectively. This is guaranteed by the law of definite proportions.
Laws of Chemical Combination
Laws of Chemical Combination are one of the most fundamental building blocks of the subject of chemistry. As in our surrounding different matter reacts with each other and form various kind of different substances. Laws of Chemical Combination are the collection of laws that explains how these substances combine together to form anything at all. When matter reacts with another matter, a chemical reaction happens which changes the form, properties, or characteristics of the matter drastically. This interaction of matter with each other is governed by the Laws of Chemical Combination.