p% = 100- 20% impuritati = 80%
ms= 450 g , c% = 36,5%
c% = mdx100/ms
=> md = msxc%/100 = 450x36,5/100 = 164,25 g HCl
M.CuCO3 = 124 g/mol , M.HCl = 1+35,5 = 36,5 g/mol
mp. g 164,25 g
CuCO3 + 2HCl --> CuCl2 + H2O + CO2
124 2x36,5
=> mp = 124x164,25/2x36,5 = 279 g CuCO3 pur intrat in reactie
80% (puritate) .......................... 279 g CuCO3 pur
100% .......................................... m.ip = 348,75 g CuCO3 impur