Răspuns:
masa si moli CaCL2 ce se prepara
p=m,px100/m,i---> m,p=280x98/100kg=274,4kg
miu=111g/mol
niu=m/miu=2,47mol
-calculez moli CaCO3 si HCl
1mol.........2mol............1mol
CaCO3 + 2HCl---> CaCL2+ H2O + CO2
x...................y...................2,47mol
x= 2,47molCco3
y= 4,94mol Hcl
-calculez masa de CaCO3 PUR,apoi impur
miu=100g/mol
m=niuxmiu=2,47x100=247g CaCO3 pur
p=m,px100.mi---> m,i=247x100/86,4g=285,9g CaCO3 impur
-calculz masa de HCl si de solutie
m=niuxmiu=4,94x36,5g=180,3g=> md
c=mdx100/ms--> ms=180,3x100/21,9g=823,3 g sol.
niu=
Explicație: