Question

calcium carbonate decomposes on heating to form calcium oxide and carbon dioxide. If 100 gms of calcium carbonate decomposes completely to form 56 gms of calcium oxide. calculate the amount of carbon dioxide formed. Which law of chemical combination helped you to solve it.

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Answer 1

According to the law of conservation of mass,,mass can never be created not be destroyed.....so in the case of reaction the mass of reactant will always be equal to the mass of the product....

.)total mass of reactant(cacium carbonate)=100g

since this mass completly breakea into carbon dioxide and oxyegen

mass of reactant (calcium carbonate)=mass of product (56+mass of carbon dioxide)

100=56+mass of CO2

mass of CO2=44g

{hope it helps}