For A 2 ( g ) ⇌ 2A ( g ) at 298 K, K p ∘ = 1 . Starting with pure A₂, find the source-requested % dissociation of A(g) at 0.375 Pa [A(g) is printed although dissociation refers to A₂].

Question

For A 2 ​ ( g ) ⇌ 2A ( g ) at 298 K, K p ∘ ​ = 1 . Starting with pure A₂, find the source-requested % dissociation of A(g) at 0.375 Pa [A(g) is printed although dissociation refers to A₂].

TestHub · Accepted Answer

For pure A₂ initially, K_p°=4α²(P/p°)/(1-α²). With K_p°=1,P=0.375 Pa,p°=10⁵ Pa, α=[1+4(0.375/10⁵)]^(-1/2)=0.9999925, about 99.999% dissociated. D,99.9%, is nearest among the choices but is not the exact percentage. The source's approximation near complete dissociation is retained.

Chemistry - Chemical Equilibrium Question with Solution | TestHub

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