ThermodynamicsHard
Question
The standard Gibbs energy change at 300 K for the reaction 2A ⇋ B + C is 2494.2J. At a given time, the composition of the reaction mixture is [A] = 1/2, [B] = 2 and [C] = 1/2. The reaction proceeds in the : [R = 8.314 J/K/mol, e = 2.718]
Options
A.forward direction because Q < Kc
B.reverse direction because Q < Kc
C.forward direction because Q > Kc
D.reverse direction because Q > Kc
Solution
ᐃGo = –RT ln Keq
⇒ 2494.2 = −8.314 × 300 ln Keq
⇒ Keq =
Now for reaction ⇒ 2A ⇒ B + C
Q =
=
= 4
∴ Q > Kc, hence reverse direction
⇒ 2494.2 = −8.314 × 300 ln Keq
⇒ Keq =
Now for reaction ⇒ 2A ⇒ B + C
Q =
=
= 4∴ Q > Kc, hence reverse direction
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