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I just need # 6,8 and 12 pls

I just need # 6,8 and 12 pls-example-1

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6. 1
SO_(3) + 1
H_(2)O --> 1
H_(2) SO_(4)

8. 1
K_(2)O + 1
H_(2)O --> 2 KOH

12. 1
CdSO_(4) + 1
H_(2) S --> 1 CdS + 1
H_(2) SO_(4)

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