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Question

By heating 10g of CaCO3, 5.6g of CaO is formed. What is the moles of CO2 obtained in this reaction?


A

1

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B

0.1

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C

10

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D

0.01

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Solution

The correct option is B

0.1


The reaction involved here is decomposition of CaCO3

CaCO3 CaO+CO2

10g 5.6g
By law of conservation of mass, 10 - 5.6 = 4.4g of CO2 should be obtained.
44g of CO2 = 1 mole of CO2

4.4g of CO2 = 110 mole of CO2


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