p=80% => masa = 400x80/100 = 4x8= 320g calcar
randamentul este 70% = intra in reactie doar 70x320/100 = 7x32 = 224 g calcar
CaCO3 ----------CaO + CO2
1 mol CaCO3...1 mol CaO
nr moli = masa/masa molara (CaCO3)
masa molara CaCO3 = 100g/mol
=> 224/100 = 2,24 moli
=> masa var stins = masa molara var stins x 2,24 moli
masa var stins = 56 x2,24 = 125.55g