11/28/2017 08:00 AM 35/100 11/27/2017 02:14 PM Print CalculatorPeriodic Table Qu
ID: 589264 • Letter: 1
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11/28/2017 08:00 AM 35/100 11/27/2017 02:14 PM Print CalculatorPeriodic Table Question 25 of 25 General Chemistry 4th Edtion University Science Books presented by Sapling Leaming Consider the following Gibbs energies at 25 Substance Ag(aq) Cr (a AgCI(s) Br (aq) AgBr(s) 77.1 -131.2 -109.8 -104.0 96.9 (a) Calculate DG'nsn for the dissolution of AgCl(s). (b) Calculate the solubility-product constant of AgCl Number Number kJ mol (c) Calculate AGran for the dissolution of AgBr(s) (d) Calculate the solubility-product constant of AgBr Number Number kJ mol- OPrevous Give up & View Sotton Check Answer @Next Exa Hint about us careers privacy policy terms of useExplanation / Answer
a) AgCl(s) <=> Ag+(aq) + Cl-(aq)
DG(rxn) = DGf(products) - DGf(reactants)
= DGf(Ag+) + DGf(Cl-) - DGf(AgCl)
= 77.1 + (-131.2) - (-109.8)
= 55.7 kJ/mol
(b) Ksp = exp(-DG(rxn)/RT))
= exp(-55.7 x 1000/(8.314 x 298.15)
= 1.74 x 10^(-10) = 1.7 x 10^(-10)
(c) AgBr(s) <=> Ag+(aq) + Br-(aq)
DG(rxn) = DGf(products) - DGf(reactants)
= DGf(Ag+) + DGf(Br-) - DGf(AgBr)
= 77.1 + (-104) - (-96.9)
= 70.0 kJ/mol
(d) Ksp = exp(-DG(rxn)/RT))
= exp(-70.0 x 1000/(8.314 x 298.15)
= 5.44 x 10^(-13) = 5.4 x 10^(-13)
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