Percent Composition Formula

Percent Composition Formula

Every chemical complex has a variety of constituent elements. Calculations involving chemical reactions occasionally require you to determine the concentration of a certain element in a given compound. Or, it is required to know how much of a certain element is present in the compound in order to comprehend how that element contributes to any stoichiometric calculations of a chemical compound. This can be determined by knowing the element’s percentage composition in a given compound, which is obtained via the formula for percent composition. The formula for percent composition by mass is used in percent composition Chemistry. The ratio of the amount of each element contained in the compound to the complex’s total sum of its separate elements is multiplied by 100 to give the formula for mass percentage, also known as the Percent Composition Formula. The Percent Composition Formula by mass, or the mass percentage of an element, is given as follows: Percent Composition by Mass = (Mass of element / Molecular weight of compound)* 100. 

What is the Percent Composition Formula?

The mass or weight of the constituent parts and the compound are typically measured in grammes. As is evident from the formula above, it is possible to represent the percentage composition of a compound in terms of each of the individual components that are present in the compound. The following mathematical formula is used to determine the percentage of the mass of an element in a compound: %CE is calculated as (gE/gT) * 100, where CE simply represents the element’s composition as a percentage, gE stands for the element’s total amount, and gT stands for the compound’s total weight. The following formula can be used to express the percentage composition of a certain element:


The percentage composition of the element E is shown here as %CE. The entire amount of element E in the compound is shown in the numerator on the right side. The denominator, on the other hand, is an expression representing the sum of the amounts of all the constituent elements in the compound.

Properties of Percent Composition Formula

The percentage composition formula is the ratio multiplied by 100. It is also feasible to determine the molecular formula for a specific compound based on the percentage makeup of an element. Given that the ratio is between an element’s and a compound’s molecular weights, this may be simply determined. Thus, the mass percentage formula is also helpful in determining the molecular formula, particularly when the chemical formula of a newly discovered chemical compound is unknown. A compound’s percentage composition is calculated by dividing the amount of each ingredient by the sum of all the individual elements in the compound and multiplying the result by 100. Now taking water, or H2O, as an example. Two hydrogen molecules make up each mole of water, which weighs 18.0152 grammes. A hydrogen atom weighs 1.008 grammes in a mole, for example. 2 hydrogen moles therefore weigh 2.016 grammes. As a result, 2.016 grammes of hydrogen make up one mole of water. Therefore, 2.016/18.0152 = 11.19% would be the hydrogen content as a percentage.

Some Simple Examples

It is necessary to solve examples based on the Percent Composition Formula. All the questions about the Percent Composition Formula can be practised by taking assistance from the Extramarks learning portal. The NCERT solutions available on the Extramarks website and mobile application are helpful in practising questions related to the Percent Composition Formula. Students are encouraged to keep revising the concepts and theories of each chapter in Chemistry. Revision helps in enhancing the preparation level of students. All the questions given in the exercises must be practised well. It is crucial to practice all the difficult questions in order to improve the knowledge of each chapter.

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FAQs (Frequently Asked Questions)

1. What is the Percent Composition Formula?

The Percent Composition Formula is given as Percent Composition by Mass = (Mass of element / Molecular weight of compound)* 100. Students need to revise the Percent Composition Formula consistently. All the topics of each chapter is important as questions can appear from each of them in the question paper of Mathematics.

2. Where can students find exact solutions to problems related to the Percent Composition Formula?

The Percent Composition Formula is essential for practising numerical problems. Students can find appropriate solutions to questions related to the Percent Composition Formula on Extramarks. Solving questions from time to time helps in retaining the Percent Composition Formula. The Extramarks learning platform has all the necessary study materials that can be used to score well in the Mathematics examination.