Calculate the percentage composition of potassium in potassium chlorate ( $K C l O_{3}$ ).
Given: Atomic mass of K = 39, Cl = 35.5 and O = 16

31.83%

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35.83%

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25.74%

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22%

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Solution

The correct option is A 31.83%
The percentage composition of an element in a compound is the mass of an element in 100 g of the compound.
Mass percentage of an element= $\frac{M a s s o f t h a t e l e m e n t i n t h e c o m p o u n d}{M a s s o f t h e c o m p o u n d} \times 100$
Mass of potassium chlorate is = $39 + 35.5 + (16) \times 3$ = 122.5
% mass of potassium = $\frac{39}{122.5} \times 100$
= 31.83%

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Similar questions

a) What is percentage composition of potassium chlorate (KClO₃).

Given:Atomic mass Of K=39,Cl=35.5andO=16

Q. Calculate the percentage composition of oxygen in potassium calculate

(K C C O_{3})

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Q. Calculate the mass of oxygen obtained by complete decomposition of 10 kg of pure potassium chlorate (Atomic mass K = 39, O = 16 and Cl= 35.5)

Calculate the percentage composition of each element in Potassium chlorate, $K C l O_{3}$

Calculate the relative molecular masses of (Use K = 39, Cl = 35.5, O = 16, C = 12, H = 1, Na = 23, N = 14, S = 32)
(a) potassium chlorate
(b) sodium acetate
(c) chloroform
(d) ammonium sulphate

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Calculate the percentage composition of potassium in potassium chlorate (KClO3). Given: Atomic mass of K = 39, Cl = 35.5 and O = 16

Calculate the percentage composition of potassium in potassium chlorate ( $K C l O_{3}$ ).
Given: Atomic mass of K = 39, Cl = 35.5 and O = 16