TLDR: Chemical composition is all about what elements make up a compound and how they are arranged and connected to each other.

Chemical composition is like the recipe for a compound. It tells us what elements are in the compound and how they are put together. Just like a recipe for a cake tells us what ingredients to use and how much of each, the chemical composition tells us what elements are in the compound and how many of each element there are.

Chemical formulas are used to describe the chemical composition of a compound. For example, the chemical formula for water is H2O, which means that each water molecule is made up of 2 hydrogen atoms and 1 oxygen atom. The chemical composition of water can be thought of as a 2:1 ratio of hydrogen atoms to oxygen atoms.

There are different types of chemical formulas that can be used to describe the composition of a compound. Empirical formulas give the simplest whole number ratio of the elements in a compound, while molecular formulas give the actual number of each element in a compound.

Chemical composition is not just about the elements in a compound, but also about how they are arranged within the molecules of the compound. This arrangement is important because it can affect the properties and behavior of the compound. Different compounds can have the same elements, but if they are arranged differently, they will have different chemical compositions and different properties.

When it comes to mixtures, the chemical composition is all about the distribution of the individual substances that make up the mixture. It's like figuring out how much of each component is in the mixture. There are different ways to measure the concentration of each component, such as molar fraction, volume fraction, mass fraction, molality, molarity, and normality.

To summarize, chemical composition is all about the elements that make up a compound and how they are arranged and connected to each other. It's like the recipe for a compound, telling us what elements are in it and how many of each. Understanding the chemical composition of a compound is important because it can help us understand its properties and behavior.