MCaCl2 = 111g/mol
Mcristalohidrat(CaCl2*nH2O) = 111+18n g/mol
111+18ng.................40g Ca
100g.......................18,265g Că
2027,415+328,77n = 4000 => 328,77n = 1972,585 => n = 6
F.M => CaCl2*6H2O
111+18n..................18n H2O
100.......................39,344
4367,184+708,192n = 1800n => n = 4
F.M => CaCl2*4H2O