Question

calculate the weight of Cao obtained by heating 200 g of 95% of pure caco3

Answer 1

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95% of 200 kg = 190 kg. 
The molar mass of CaCO₃ is 100 g/mol, so 190 kg = (190,000 g)/(100 g/mol) 
= 1900 mol. 
CaCO₃ → CaO + CO₂, so 1900 mol of CO₂ are removed by heating. The molar mass of CO₂ is 44 g/mol, so 1900 mol = (1900 mol)(44 g/mol) = 83 600 g = 83.6 kg. 
190 kg - 83.6 kg = 106.4 kg CaO.