Chemistry 1 notes 6 - EXERCISE Ca1CulatiOn of Percent...

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Unformatted text preview: EXERCISE? Ca1CulatiOn of Percent Composition - Explanation: The percentage composition of a compound is the percentage by weight of each element present. In the formula-of a compound, the subscript numbers represent the number of . moles of atoms present in one mole of the compound. The percentage composition of any . -' quantity bf the compound is the same as the percentage Composition of a single mole of the ' Compound. ' ' - Example: Calculate the percentage composition of potassium chlorate, KClO3. ‘ Solution: _ Step 1: Calculate the molecular mass of the compound KC103. ‘ K =I .39g/mol" - 61 I = 35.5 g/mol 3 o u = .A37x1,6=848'g1m01- 1 Molecular = 122.5 g/mol Mass - ‘ . Step2: Calculate percent of each element in the compound. Molar Weight ofK ‘ _ _ .39'g , %K = _ ‘ X100 .. = ,_ ,x100--=‘ 31.84% - Molar weight of KC103 I 122.5 g Molar weight of Cl ’ ' ' 35.5 g . %C1 = X 100 = - X 100 = 28.98% Molar weight of KClO3 122.5 g ' Molar weight of o ' 48 g . _ %O ' = ’ x100 = —.——_ x100 = 39.18% Molar weight of KC1'03 , 122.5 g Make sure the sum of all the percents = 100% 100.00% Hint: Round the percents to l or 2 decimal places for best accuracy. ...
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