1mol Ca(OH)2.....1mol Ca
4mol.........................x4molCa
1molCa......1mol CaCO3
4mol............X= 4mol CaCO3 PUR
M,CaCO3=(4OgCa+12gC+3x16gO)/mol= 1oog/mol
m,CaCO3= nxM= 4molx100g/mol=400g pur
p=m,px100/m,impur
60= 400x100/m,impur..............................calculeaza m,impur !