A reaction of heating calcium carbonate produces calcium oxide and carbon dioxide gas. Heat 10.0 g calcium carbonate until no more
carbon dioxide gas is given off. The remaining material has a mass of
5.6 g. What mass of carbon dioxide gas was produced in the reaction?
g

4.4g

Explanation:

Given:

   Mass of calcium carbonate  = 10g

   Remaining mass  = 5.6g

Unknown:

Mass of carbon dioxide gas produced from the reaction  = ?

Solution:

The reaction equation is expressed below;

    CaCO₃   →   CaO + CO₂

According to the law of matter, matter is neither created nor destroyed in a chemical reaction but transformed from one form to another.

          CaCO₃   →   CaO + CO₂

CaCO₃ is a solid

 CaO is a solid

   CO₂ is a gas

    CaCO₃   →   CaO + CO₂

After the heating, CO₂ is given off;

 Mass of CO₂ = Mass of starting CaCO₃ - Mass of CaO

                        = 10g - 5.6g

                        = 4.4g

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