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If the molecular mass of Na(2)S(2)O(3) a...

If the molecular mass of `Na_(2)S_(2)O_(3)` and `I_(2)` are `M_(1) and M_(2)` respectively, then what will be the equivalent mass of `Na_(2)S_(2)O_(3)` and `I_(2)` in the following reaction
`2S_(2)O_(3)^(2-)+I_(2)rarrS_(2)O_(6)^(2-)+I`

Text Solution

Verified by Experts

` 2Na_(2)S_(2)O_(3)=Na_(2)S_(4)O_(6)`
Total increase is O.N of S for molecules of `Na_(2)S_(2)O_(3)=4xx2.5-2[2(+2)]=2`
`therefore` Total increase in O.N of S per molecule of `Na_(2)S_(2)O_(3)=1`
`therefore` Eq mass =`M_(1)//1=M_(1)`
now `I_(2)^(2)rarrr2I^(-1)`
Total decrease is O.N per molecule of `I_(2)=0-2(-1)=2`
`therefore` Eq mass of `I_(2)=M_(2)//2`
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