Question

Calculate the percent composition by mass of each element in KClO3.

Answer 1

Answer:

KClO3 molecular weight

Molar mass of KClO3 = 122.5495 g/mol

This compound is also known as Potassium Chlorate.

Convert grams KClO3 to moles or moles KClO3 to grams

Molecular weight calculation:

39.0983 + 35.453 + 15.9994*3

Percent composition by element

Element Symbol Atomic Mass # of Atoms Mass Percent

Chlorine Cl 35.453 1 28.930%

Oxygen O 15.9994 3 39.166%

Potassium K 39.0983

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Answer 2

Answer:

%K = 31.83

%Cl = 28.93

%O = 39.17

Explanation:

The molar mass of KClO3:

K = 39 g

Cl = 35.5 g

O3 = 48 g

Total = 122.5 g

Percent K = 39/122.5 x 100% = 31.83%

Percent Cl = 35.5/122.5 x 100% = 28.93%

Percent K = 48/122.5 x 100% = 39.17%