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Calculate the equivalent weight of SO2 i...

Calculate the equivalent weight of `SO_2` in the following reactions:
(a) `SO_(2) + 2H_(2) S = 3 S + 2H_(2) O`
(b) `5SO_(2) + 2KMnO_(4) + 2H_(2) O = K_(2) SO_(4) + 2MnSO_(4) + 2H_(2) SO_(4)`

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