# Which Of The Following Compounds Have The Same Empirical Formula What Is Percent Composition?

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## What Is Percent Composition?

People use cookbooks to learn how to cook dishes, and the right amount of ingredients are used to prepare the dishes according to the instructions in the cookbooks. The amount of ingredients in a dish is fixed, which means that there is a correct percentage for a particular ingredient. In chemistry, the amount or percentage of elements in a chemical compound is similar to the ingredients in dishes.

A chemical compound is made up of different elements in a fixed amount or percentage, and when the percentage of the elements is changed, the compound also changes. A chemistry textbook explains this term as follows: “The relative amount of elements in a compound is expressed as the composition or percentage by mass of each element in the compound.” To determine the composition of an unknown compound, people need to calculate the percentage of all elements present in the compound, and a formula is developed for this calculation.

To calculate the percentage of elements in a compound, people need to know how to use this formula. This formula is not complicated, and a chemistry textbook explains that “the mass percent of an element in a compound is the number of grams of the element divided by the mass of the compound in grams, multiplied by 100%.” . For example, if there is a single water compound, the percent composition of hydrogen should be the mass of hydrogen times the mass of the compound and then multiply the result by 100%.

Sometimes people only get the chemical formula of a compound. In this situation, the molar mass of each element is used for the calculation. This way is similar to the previous one and the textbook explains that “Divide the mass of each element by the molar mass and multiply the result by 100%”. People can find the molar mass or atomic mass of elements on the periodic table, and the molar mass of a compound is the molar mass of all the elements in that compound.

What can be done with a percentage composition? The first thing is that people can use it as a conversion factor. The textbook explains that “Percent composition allows you to calculate the number of grams of any element in a given mass of a compound. To do this, multiply the mass of the compound by a conversion factor based on the percent composition of the element.” For example, if there are ten grams of water, people can multiply the percent composition of hydrogen by ten grams and then they get the mass of hydrogen. The same can be done to calculate the mass of oxygen.

Another use of percent composition is that you can use it to calculate the empirical formula of a compound. The empirical formula of a compound gives the lowest integer ratio of atoms in the compound. To calculate this, people have to use the percent composition of each element to calculate the moles of each element. This can be done by dividing the molar mass of an element by the percentage of that element. Next, find the element with the smallest number of moles and divide all the numbers of moles by the smallest number of moles. If the results are not whole numbers or not close to whole numbers, multiply each result by the smallest whole number. After this step, the empirical formula of the compound is calculated.

Consequently, the way to calculate percentage composition is simple and can be used as a conversion factor or to calculate an empirical formula. Also, there are many things in people’s lives that are simple but contain great value or produce great effects, such as cookbooks and other manuals.

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