Q.

What weight of CaCO3 must be decomposed to produce the sufficient quantity of carbon dioxide to convert 21.2 kg of Na2CO8 completely in to NaHCO3, [Atomic mass Na= 23, Ca= 40]

CaCO3CaO+CO2Na2CO3+CO2+H2O2NaHCO3

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a

20 Kg 

b

120 Kg 

c

100 Kg 

d

30 Kg

answer is A.

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Detailed Solution

CaCO3CaO+CO2

1005644

Na2CO3+CO2+H2O2NaHCO3106+18+442×84

Now you have 20 kg so 21200×44106.

=8.8 kg of CO2 needed

From eq.1 88000×10044

=20 kg of CaCO3 is needed.

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