Question

Calcium carbonate decomposes on heating to form calcium oxide and carbon dioxide. When 10 g of calcium carbonate is decomposed completely then 5.6 g of calcium oxide is formed.calculate the mass of carbon dioxide

Answer 1

mass of co2= 10-5.6=4.4g

Answer 2

SOLUTIONS:

The problems to be solved by using the law of conservation of mass in chemical reactions.

In this reaction, calcium carbonate (CaCO₃) is the reactant where as calcium oxide (CaO) and carbon dioxide (CO₂) are products.

Now, from the law of conservation of mass we have :

» Mass of products = Mass of reactants.

or, Mass of CaO + Mass of CO₂ = Mass of CaCO₃

So, 5.6 + Mass of CO₂ = 10

And, Mass of CO₂ = 10 - 5.6

Or, Mass of CO₂ = 4.4 g

Thus, the mass of carbon dioxide formed is 4.4 g.