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masa molowa CuSO4 = 159,5g/mol
Cmolowe : n = 20,7g/159,5 = 0,13 mola
v roztworu = m/d =120,7g/1,2 = 100,56cm3 = 0,1dm3
to c = 0,13/0,1 = 1,3 mol/dm3