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Question

For N2O4(g)2NO2(g),the value of degree of dissociation as a function of equilibrium pressure P and equilibrium constant Kp is α=Kp(4p+Kp) True or false?


A

True

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B

False

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Solution

The correct option is A

True


Assume there are initially n moles of reactant only. Derive Kp as in the previous problem

Kp=P2NO2PN2O4=[{2αl(1+α)}P]2{(1α)/(1+α)}P=4α2P1α2

Solving for α, we get α=Kp(4P+Kp)

The same could be tried for other reactions as well:

2NH3(g)N2(g)+3H2(g)

2NO(g)N2(g)+O2(g)

PCl5(g)PCl3(g)+Cl2(g)

2Hl(g)H2(g)+l2(g)

2H2S(g)2H2(g)+S2(g)

What about the following reaction?

NH4HS(s)NH3(g)+H2S(g)

Hint within a hint: Active mass of a solid


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