Calculate Ksp for PbI2 at 25 C based on the following data:(adsbygoogle = window.adsbygoogle || []).push({});

SPECIES------------deltaG_f kJ/mol

Pb (2+) (aq) -------(-)24.4

I- (aq)-------------(-)51.6

PbI2 (s)------------(-) 173.6

a. 4 x 10-31

b. 8 x 10-18

c. 9 x 10-9

d. 5 x 10-5

PbI2 <-> Pb (2+) + 2I-

Use G_f = sigma prod. - sigma reactants

[2(-51.6) - 24.4]kJ - [-173.6]kJ

G_f = 46 kJ = 4.6E3 J

ln K = -G/RT

K = e^-(4.6E3/(8.314*298.15 K) = 8.72E-9

Thanks.

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# Entropy and Equilibrium Constant

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