Respuesta :
The percent composition of potassium in KCN is 60.045%.
All substances that consists of atoms or molecules. In chemistry, it is very important to measure their amounts accurately. The mole is used to express the amounts of reactants and products of chemical reactions. The mole, symbol mole, and the SI unit of the amount of substance. One mole contains exactly 6.02214076×10²³ elementary entities. This number is the fixed numerical value of the Avogadro constant.
Percentage composition of a compound is the ratio of an amount of each element to the total amount of individual elements in a compound, which is then multiplied with 100. Let us take an example of H2O . So, water has 2 molecules of hydrogen, and one mole of water is of 18.0152 grams.
And one mole of a hydrogen atom is of 1.008 grams. So, 2 hydrogen moles weighs 2.016 grams. Hence, one mole of water has 2.016 grams of hydrogen mole. Therefore, the percentage composition of hydrogen would be 2.016/18.0152 = 11.19%.
Similarly in case of KCN the percentage composition of Potassium in KCN is 60.045%.
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