Question

30 g of certain sample of potassium chlorate on heating gives 14.9 g of potassium chloride and 9.6 g of oxygen. If law of conservation of mass is true, what mass of potassium chlorate is left undecomposed?​

Answer 1

Answer:

5.5 g

Explanation:

Law of Conservation of Mass states that Mass of reactants and Mass of products are equal in chemical reaction that means Atoms cannot be created or destroyed, just they transfer.

So,

Let Mass of Potassium Chlorate (undecomposed) = x grams

Here, Mass of reactants is Mass of Potassium Chlorate heats = 30 g

Here, Mass of products is Mass of Potassium Chloride + Mass of Oxygen + Mass of Potassium Chlorate (undecomposed) = 14.9 g + 9.6 g + x

We know that Mass of reactants = Mass of products [From Law of Conservation of Mass]

So,

30 = 14.9 + 9.6 + x

30 = 24.5 + x

x = 30 - 24.5

x = 5.5 g ===> Mass of Potassium Chlorate [undecomposed]