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Asked Oct 23, 2019
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4
Calculate the percent composition by mass of each element in KCIO,.
% K =
%
% Cl =
% O =
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Lave Upt Resources 4 Calculate the percent composition by mass of each element in KCIO,. % K = % % Cl = % O =

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Expert Answer

Step 1

The given compound is KClO4

Molar mass of K = 39 g/mol

Molar mass of Cl = 35.5 g/mol

Molar mass of O = 16 g/mol

Molar mass of KClO4 = 39 + 35.5 + (4×16) = 138.5 g/mol

Step 2

1 mole of KClO4 (138.5 g) contains 1 mole of K (39 g).

Therefore, the mass % of K can be calculated as:

Mass of K
x 100%
% K =
Mass of KCIO4
39 g
% K
x 100% 28.16 %
138.5 g
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Mass of K x 100% % K = Mass of KCIO4 39 g % K x 100% 28.16 % 138.5 g

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Step 3

1 mole of KClO4 (138.5 g) contains 1 mole of Cl (35.5 g).

There...

Mass of Cl
% Cl
100%
=
Mass of KC1O4
35.5 g
100% 25.63 %
138.5 g
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Mass of Cl % Cl 100% = Mass of KC1O4 35.5 g 100% 25.63 % 138.5 g

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