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How many grams of H(2) S will react with...

How many grams of `H_(2) S` will react with 6.32 g of `KMnO_(4)` to produce `K_(2) SO_(4) and MnO_(2)` ?

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The correct Answer is:
0.511 g
ON change for Mn, `+ 7` to `+ 4` and for S, `- 2` to `+ 6`
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