CuO + H1 2S6 O -2 4--------------Cu2 S6 O -2 4 + H1 2 O -2 + S4 O -2 2

Cu0 +2 e -------------- Cu2

S6 -2e -------------- S4

2(Cu0 +2 e -------------- Cu2 ) = 2Cu0 +4e -------------- 2Cu2

2(S6 -2e -------------- S4 ) = 2S6 -4e -------------- 2S4

Cu + 2H2SO4--------------CuSO4 +2 H2O + SO2

1-Cu-1

2-S-2

8-O-8

4-H-4

Cu + H2SO4--------------CuSO4 + H2O + SO2

Mg 1 Cu = 63 x1 63 g/m Mg 2 H= 1 x 4 = 4 S= 32 x 2 = 64 O=16 x 8 = 128 196 m/g Mg3 Cu= 63 x1 =63 S= 32 x1= 32 O= 16 x 4= 64 =159 m/g Mg4 H= 1x4= 4 O= 16 x 2= 32 =36 m/g

Mg 5S =32 x 1 = 32O= 16 x 2 = 32=64 m/g

Fe3 2 O-2 3 + C2 O-2 ------------ Fe0 + C4 O-2 2

Fe3 -3e- ------------ Fe0

C2+2e ------------ C4

2(Fe3 -3e- ------------ Fe0 ) = 2Fe3 -6e- ------------ 2Fe0

3(C2+2e ------------ C4 ) = 3C2+6e ------------ 3C4

Fe2 O3 + 3CO ------------ 2Fe +3CO2

2-Fe-2

6-O-6

3-C-3

Fe2 O3 + CO ------------ Fe + CO2

Mg 1 Fe= 56 x 2 =112 O = 16 x 3 =48 = 160 m/g Mg 2 C = 12 x 3 = 36 O= 16 x 3 =48 =84 m/g Mg 3 Fe= 56 x 2= 112 =122 m/g Mg 4 C =12 x 3 = 36 O=16 x 6 = 96 =132 m/g