Which of the following is true delta G = for all solid at 0 degree C. The two fa

Question

Which of the following is true delta G = for all solid at 0 degree C. The two factors that determine if a reaction is spontaneous are temperature and entropy. An endothermic reaction with increasing entropy is never spontaneous. S > 0 for a solid at 10 K. In the following galvanic cell, E = 0.920 V. The shorthand notation for the cell is written below in addition to the reduction potentials. zn(s)|zn^2+ || Pt, s(s)|H_2S (4.00 M) (aq) The [H^+] = 6.89 times 10^5 M (acidic) Zn^2+ + 2e- ---à Zn (s) -0.762 s (s) + 2H^+ + 2e -à H_2S (aq) 0.144 Write the balanced redox equation for this process. Determine the [Zn^2] using the Nernst equation which is shown below E = E degree -(0.0592/n)logQ

Explanation / Answer

9. True statements are,

b.

As temperature increases entropy increases for any reaction

c.

Entropy is greater for solids than at 0 K

10. Using nernst equation,

E = Eo - 0.0592/n log([Zn2+]/[H+]^2)

feed the given values,

0.920 = 0.144 - (0.762) - 0.0592/2 log([Zn2+]/(6.89 x 10^-5)^2)

So,

[Zn2+] = 1.60 x 10^-9 M

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