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Find the numbers of moles of As(2)S(3) r...

Find the numbers of moles of `As_(2)S_(3)` required to reduce `56` moles of `HNO_(3)` according to reaction,
`As_(2)S_(3)+HNO_(3)rarrH_(3)AsO_(4)+H_(2)SO_(4)+NO`

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Verified by Experts

The correct Answer is:
6
`(As^(3+))_(2) rarr 2As^(5+) + 4e, 3e + N^(2+)] xx 28` ….(1)
`(S^(2-))_(3) rarr 3S^(6+) + 24e`
`As_(2)S_(3) rarr 2H_(2)AsO_(4) + 3H_(2)SO_(4) + 28 e] xx3` …(2)
By eqs. (1) and (2),
`3As_(2)S_(3) + 28HNO_(3) rarr 6H_(3)AsO_(4) + 9 H_(2)SO_(4)+28NO`
`:. 3As_(2)S_(3) -= 28 HNO_(3)`
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