Question

For the chemical reaction X ⇄ Y , the standard reaction Gibbs energy depends on temperature T (in K) as
∆ᵣG⁰ (in kJ mol⁻¹) = 120 – (3/8)T The major component of the reaction mixture at T is:
(A) Y if T = 300 K (B) Y if T = 280 K (C) X if T = 350 K (D) X if T = 315 K

Answer 1

The major component of the reaction mixture at T is 'X if T = 315 K'

Explanation:

As we know,

a). ΔG° = 120 - (3/8) * 300

= 7.5

Here, Y is not maximum.

b). ΔG° = 120 - (3/8) * 280

= 15

Here also, Y is not maximum.

c). ΔG° = 120 - (3/8) * 350

= 11.25

Here, X is minimum.

d) ΔG° = 120 - (3/8) * 315

= 1.875

Here only, X is maximum.

Thus, option D i.e. 'X if T = 315 K' is the correct answer.

Learn more: Gibbs Energy

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