How is percent composition of a compound calculated?

The percent composition of a compound is determined by calculating the mass of each element in the compound relative to the total mass of the compound, and then converting that ratio into a percentage. This process involves taking the mass of each individual element within the compound and dividing it by the total mass of the compound.

After obtaining this fraction, it is then multiplied by 100 to express it as a percentage. This method provides a clear picture of how much of the total mass of the compound is contributed by each element, which is critical for understanding the compound's chemical properties and stoichiometry.

The calculation is fundamental in chemistry, especially in areas such as stoichiometry, because it helps in determining empirical formulas, molecular formulas, and understanding how compounds may react based on their elemental composition.