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What Is Percent Composition?
People use cookbooks to learn how to make dishes, and they will use the correct amount of ingredients for dishes according to the directions in the cookbooks. The amount of ingredients in a dish is fixed, meaning that there is an appropriate percentage of a particular ingredient. In chemistry, the amount or percentage of substances in a chemical compound is the same as the ingredients of dishes.
A chemical compound is made up of different substances with a fixed amount or percentage, and if the percentage of the substances is changed, the compound will also be changed. In a Chemistry textbook, this concept is explained as, “The relative amounts of elements in a compound are expressed as a percentage composition or a percentage by weight of each element in the compound”. In order to determine the composition of an unknown compound, people must calculate the percentage of all elements in the compound, and develop a formula for this calculation.
In order to calculate the percentage of an element in a compound, people need to know how to use this formula. This formula is not difficult, and it is explained in the Chemistry book that, “The percentage by weight of the substance in the compound is the number of grams of the substance divided by the weight in grams of the compound, multiplied by 100%”. For example, if there is one compound of water, the percentage of hydrogen composition should be the weight of hydrogen over the weight of the compound, and multiply the result by 100%.
Sometimes people find the chemical formula of a compound. In this case, the molar mass of each element will be used for the calculation. This method is similar to the previous one, and is described in the textbook, “Divide the mass of each element by the molar mass and multiply the result by 100%”. People can find the molar mass or atomic weight of elements in the periodic table, and the molar mass of a compound is the total molar mass of all the elements in the compound.
What can be done with the composition percentage? The first thing is that people can use it as a conversion tool. The textbook explains that “You can use composition percentages to calculate the number of grams of any element in a given weight of a compound. To do this, multiply the weight of the compound by a conversion factor based on the percentage composition of the element in the compound”. For example, if there are ten grams of water, people can multiply the percentage of hydrogen composition by ten grams, and then they can get the weight of hydrogen. The same thing can be done to calculate the mass of oxygen.
Another use of percent composition is that you can use it to calculate the proof formula of a compound. The empirical formula of a compound gives the lowest number of atoms in the compound. In order to calculate this, people must use the percent composition data for each element to calculate the moles of each element. The way to do this is to divide the molar mass of an element by the percentage of that element. Next, find the element with the lowest mole, and divide all the mole numbers by the lowest. If the results are not whole numbers or not close to whole numbers, multiply each result by the smallest whole number. After these steps, the empirical formula of the compound will be calculated.
As a result, the method of calculating the composition of percentages is simple, and can be used as a conversion factor, or it can be used to calculate the proof formula. Also, there are many things in people’s lives that are simple, but have high value or make great results, such as cookbooks and other handbooks.
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