Question

Determine the equilibrium constant at 298 K for the reaction: Zn (s) + Ni²⁺ (aq) Zn²⁺ (aq) + Ni (s) (Hint: Start with the E°)

A) (4.1 ± 0.1) x 10 ³

B) (1.7 ± 0.1) x 10 ¹⁷

C) (9.3 ± 0.1) x 10 ⁸

D) (6.4 ± 0.1) x 10 ^-6

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Consider the following reaction: CO(g) + H₂O(g) CO₂(g) + H₂(g). Assume ΔH°_rxn = 41.0 kJ/mol for all temperatures in this problem. If K_p = 5.10 at 700K, at what temperature will K_p = 2.5?

A) (692 ± 2) K

B) (685 ± 2) K

C) (779 ± 2) K

D) (636 ± 2) K

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For the process involving compound A: A(s) → A(l), ΔH° = 8.8 kJ/mol, and ΔS° = 36.4 J/mol•K. What is the melting point of compound A?

A) (31 ± 1) ℃

B) (-242 ± 1) ℃

C) (-31 ± 1) ℃

D) (242 ± 1) ℃

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Calculate ΔS° for the reaction of N₂O₅(g) (S° = 355.3 JK^-1mol^-1) to make NO₂(g) (S° = 239.9 JK^-1mol^-1) and
O₂(g) (S° = 204.8 JK^-1mol^-1) at 25°C.

A) (453.8 ± 0.5) J/K

B) (-249.2 ± 0.5) J/K

C) (-115.6 ± 1) J/K

D) (89.5 ± 0.5) J/K

(89.5 ± 0.5) J/K