Question

4.9 g of potassium chlorate when heated produced1.92 g of oxygen and the residue left behind weighed 2.96 g.Show that these results illustrates the law of conservation of mass.

Please explain nicely.​

Answer 1

Answer:

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Explanation:

2KClO3  → 2KCl+3O2

​  Mass of the reactant = total mass of the products (2.96+1.92=4.88 g)

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

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Answer 2

Explanation:

Law of conservation of mass means The entire mass of a system during a chemical reaction remains same in one form or another after the experiment.

This is what text say, now its very easy to understand. It basically says that mass of reactants and mass of products should be same in a chemical reaction. And it makes sense, you don't create masses right!! Nor we can destroy it. We can only change the mass from one form to another. Coming back to question:

Mass of reactant = Mass of Pottasium Chlorate

= Mass of KClO4

= 4.9 g

It is heated and a chemical reaction takes place to form a residue (KCl) and oxygen is realeased.

Mass of product

= Mass of oxygen released + Mass of residue

= 1.92 g + 2.96 g

= 4.88 g

Now my mass of reactant should have been equal to mass of products.

Mass of reactant = 4.9 g

Mass of product = 4.88 g

Now you can do two things:

#1. Maybe there is a typo error in the numerical values.

#2. Make a approximation !!

Maybe because of physical factors tge numerical data recorded is having a slight error which can be neglected.

So, 4.88 ~ 4.9

and, Mass of product ~ Mass of reactant.

~ : approximation sign.

Remember one thing that mass of reactants must be equal to mass of product.