What is the percent composition of potassium in KNO3

38.6%

Explanation:

Molar mass of KNO3 is

=39+14+(16*3)

=53+48

=101 g/mol

Now

Percentage composition of potassium in KNO3 is=(atomic mass of K*no. of atoms)/molar mass of KNO3 *100%

%age composition of K= (39*1)/101 *100%

=0.386*100%

=38.6%

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.

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