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At constant temperature 80% AB dissociat...

At constant temperature 80% AB dissociates into `A_2` and `B_2`, then the equilibrium constant for `2AB(g)⇌A_2(g) +B_2(g)` is ?

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A(p, q, s), B(q, r, s), C(r, s,t ), D( r, s, t )
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