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CuSO4(Ar)

Ar(Cu)=64

Ar(S) = 32

Ar(O) = 16

64 • 1,66 = 10,624

32 • 1,66 = 5,312

16 • 1,66 = 2,656

Mr(CuSO4)=64 • 1 + 32 • 1 + 16 • 4 = 160

64 • 1 + 32 • 1 + 16 • 4 = 160

64 • 1 : 160 • 100 = 40

32 • 1 : 160 • 100 = 20

16 • 4 : 160 • 100 = 40