Răspuns:
niu,CO2=V/Vm= 44,8/22,4mol=2mol
1mol.......................................1mol
CaCO3(pur)----> CaO + CO2
x...............................................2mol
x=niu=2mol CaCO3
m=niuxmiu=2x100g=200g CaCO3 PUR
P=80%
p=m,px100/m,i-->. m,i= m,px100/p= 200x100/80g=250g CaCO3 IMPUR
Explicație: