What weight of CaCO3 must be decomposed to produce the sufficient quantity of carbon dioxide to convert 21.2 kg of Na2CO3 completely into NaHCO3? (Atomic mass of Na=23, Ca=40) CaCO3--- CaO+CO2 Na2CO3+CO2+H2O------ 2NaHCO3 a) 100kg b)20kg c)120kg d)30kg

What weight of CaCO3 must be decomposed to produce the sufficient quan

1.	What weight of CaCO3 must be decomposed to produce the sufficient quantity of carbon dioxide to convert 21.2 kg of Na2CO3 completely into NaHCO3? (Atomic mass of Na=23, Ca=40) CaCO3--- CaO+CO2 Na2CO3+CO2+H2O------ 2NaHCO3 a) 100kg b)20kg c)120kg d)30kg
Answer» B) 20kgExplanation: molecular mass of Na2CO3=106gm, that of CO2=44gm and of CACO3=100gm If x GM CO2 react completely with sod carbonate --> x=(21.2X44)/106= 8.8 kg and this 8.8kg CO2 evolve only when 20 kg CaCO3 is decomposed (using rule of proportion or unitary method). Note;44 gm CO2 is RELEASED on decomposition of 100g of CaCO3.