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0.0755 g of selenium vapours occupying a...

`0.0755 g` of selenium vapours occupying a volume of `114.2 mL` at `700^(@)C` and `185 mm` of `Hg`. The vapours are in equilibrium as: `Se_(6(g))hArr3Se_(2(g))`
Calculate:
(`i`) Degree of dissociation of `Se`,
(`ii`) `K_(p)`,
(`iii`) `K_(c)`.
Atomic weight of `Se` is `79`.

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(`i`) `59%`, (`ii`) `0.168 atm`, (`iii`) `2.633xx10^(-5) mol^(2) litre^(-2)` ,
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