A.25
B.26
C.27
D.28

A.14,32.
B.19,20.
C.15,60.
D.10,80.

A.3
B.4
C.5
D.1

A.16,03%.
B.54,64%.
C.29,33%.
D.4,04%.

A.87,60.
B.52,59.
C.41,00.
D.64,50.

A.55,68%.
B.47,56%.
C.46,73%.
D.54,52%.

A.2,7.
B.3,2.
C.3,5.
D.3,0.

A.2
B.3
C.4
D.5

A.FeCl3.
B.MgCl2.
C.NaOH.
D.CuSO4.

A.17,92.
B.8,96.
C.22,40.
D.11,20.