What is the formula used to calculate the percent composition of an element in a compound?

To determine the percent composition of an element in a compound, the correct formula is the mass of the element divided by the mass of the compound, multiplied by 100. This formula expresses the mass of the specific element as a percentage of the total mass of the compound, providing a clear representation of how much of the compound's weight is contributed by the element in question.

Percent composition is a crucial concept in chemistry as it helps in understanding the proportion of each element within a compound, which can be particularly useful in stoichiometric calculations and in identifying substances. By using the mass of the element and the total mass of the compound, you accurately quantify the contribution of each element, enabling comparisons and analysis of different compounds.