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V=500cm3=0,5dm3
ms=80g
M Na2SO4=142g/mol
80g-xmol
142g-1mol
x=0,56mol
0,56mol-0,5dm3
x---1dm3
x=1,12mol/dm3
2
Cm=0,2mol/dm3
0,2mol-1dm3
x-- 0,3dm3
x=0,06mol
M CuSO4=160g/mol
160g-1 mol
x-0,06mol
x=9,6g