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M CaSO4 x H2O = 40 + 32 + 16 x 4 + 2(1 x 2 + 16 ) = 40 + 32 + 64 + 36 =
172 u
% 2H2O = 36/172 x 100 % = 20,9 % ~ 21 %
odp; zawartosc procentowa wody wynosi 21 % .