`0.020` g of selenium vapour at equilibrium occupying a volume of `2.463` mL at `1` atm and `27^(@)C.` The selenium is in a state of equilibrium according to reaction `3Se_(2)(g)hArrSe_(6)(g)` What is the degree of association of selenium ? (At.mass of se `=79`)
A
`0.205`
B
`0.315`
C
`0.14`
D
None of these
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The correct Answer is:
B
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