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The mass of CaO obtained by the decompostion of 2 moles of CaCO3 is:
Molar mass of calcium carbonate = 100 g/mol
Molar mass of calcium oxide = 56 g/mol
  1. 100 g
  2. 112 g
  3. 106 g
  4. 56 g


Solution

The correct option is B 112 g
CaCO3CaO+CO2
Moles of calcium carbonate= 200100=2
1 mole of calcium oxide can be obtained from 1 mole of calcium carbonate.
Hence, 2 moles of CaO is formed.
Mass of calcium oxide = 2×56=112 g

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