What is the significance of relative abundance in chemistry and how does it impact the analysis of chemical compounds?

Relative abundance in chemistry refers to the proportion of different isotopes of an element present in a sample. It is significant because it affects the average Atomic Mass of an element. When analyzing chemical compounds, the relative abundance of isotopes must be considered to accurately determine the molecular weight and composition of the compound. This is important for various applications in chemistry, such as identifying unknown substances and studying reaction mechanisms.