Question

when potassium chlorate, kclo₃, is heated, it decomposes into potassium chloride and oxygen products of the reaction and their masses.
2kclo₃ → 2kcl + 3o₂
? g 3.7 g 2.4 g
what mass of potassium chlorate, in grams, is decomposed in this reaction?
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Explanation:

Step1: Apply the law of conservation of mass

According to the law of conservation of mass, the mass of reactants is equal to the mass of products in a chemical reaction.

Step2: Calculate the mass of \(KClO_3\)

The mass of \(KClO_3\) decomposed is the sum of the masses of \(KCl\) and \(O_2\) produced. So, \(m(KClO_3)=m(KCl)+m(O_2)\)
Substitute \(m(KCl) = 3.7\space g\) and \(m(O_2)=2.4\space g\) into the formula: \(m(KClO_3)=3.7 + 2.4\)

Answer:

\(6.1\space g\)