Question

22. A process has an equilibrium constant K of 2.5 x 10' at 300 K. What is AGⓇ at that temperature? A) 19.5 kJ/mol B) 25 kJ/mol C) -19.5 kJ/mol D) 75 kJ/mol 23. In heterogeneous catalysis, the catalyst and reactants are in A) the same B) different C) gaseous phases. D) liquid 24. If the reaction quotient Q. is smaller than K, the reaction will proceed A) to produce more product B) to produce more reactant C) nowhere D) to stoichiometric completion

Answer 1

Ans 22)

ΔG=ΔG0+RTlnQ where Q is the ratio of concentrations (or activities) of the products divided by the reactants. Under equilibrium conditions, Q=K (equilibirium constant) and ΔG=0 so ΔG0=−RTlnK = -(8. 314 j/mol.K)(300K) (ln 2.5*10^3) = -19514. 7 j/mol = -19.5 kj/mol.

Ans 23

As heterogeneous name refer different

In heterogeneous catalysis, catalyst and reactants are in different phase.

Ans 24)

If reaction quioent is less than Kc

The equilibrium must move in a forward direction and to produce more products

Explanation:

For the reaction,

A+B⇌C+D,

we write Kc=[C][D]/[A][B]

This describes an equilibrium condition, where the rate of forward reaction is equal to the reverse rate of reaction.

Under non-equilibrium conditions, (for instance at the start of the reaction), we write Q(rxn quotient) =[C][D]/[A][B].

At the start of the reaction, we can conceive that the reactant concentrations, [A] and [B], are LARGER than they would be at equilibrium, so Qrxn < Kc,and so the reaction proceeds in a forward direction, until Qrxn = Kc.