Q4 of 29 Page 85

Carbon dioxide is added to 112g of calcium oxide. The product formed is 200g of calcium carbonate. Calculate the mass carbon dioxide used. Which law of chemical combination will govern your answer.

The reaction taking place is:



Let the mass of CO2 is xg.


According to the law of conservation of mass, the mass of reactants is equal to the mass of products.


Therefore,


⇒ x + 112g = 220g


⇒ x = 220g – 112g


⇒ x = 108g


Thus, the mass of carbon dioxide is 108g.


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