va rog urgent dau coaroan si stele plisss

Răspuns:
MCaCO3 =40+12+4×16=100kg/kmol
MCaO =40+16=56kg/kmol
100kg............56kg
CaCO3 => CaO + CO2
xkg.................280kg
x=280×100/56=500kg CaCO3
mCaCO3=mpur =500kg
mtotal =mpur×100/p=500×100/80=625 kg