Hydrogen cyanide can isomerize
Hydrogen cyanide can isomerize to hydrogen isocyanide: HCN(g)=HNC(g)
Delta g f. 75.0. 120.0
A) calculate the equilibrium constant of this reaction at25.0.
B) if Phcn= 1.000 arm, what is the partial pressure of HNC atequilibrium?
Answer:
HCN(g) <————-> HNC(g)
Go = Gproducts – G reactants
= 120 – 75
= 45 kJ/mol
Go = – R T lnKp
45 = – 8.314 x 10^-3 x 298 x ln Kp
Kp = 1.29 x 10^-8
equilibrium constant = 1.29 x 10^-8
B)
HCN (g) <————> HNC (g)
1 0
1- x x
Kp = x / 1- x
1.29 x 10^-8 = x / 1 – x
x = 1.29 x 10^-8 atm
partial pressure of PHNC = 1.29 x 10^-8atm
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