## Tl2SO4 (aq) + 2 NaI (aq) → 2 TlI (s) + Na2SO4 (aq)

Back to reactions list

## Stoichiometry

Enter a mass or volume in one of the boxes below. Upon hitting submit, the stoichiometric equivalents will be calculated for the remaining reactants and products. All gases are assumed to be at STP.

 Tl2SO4         Mass: g or Solution Volume: mL of Concentration: mol/L NaI            Mass: g or Solution Volume: mL of Concentration: mol/L TlI            Mass: g Na2SO4         Mass: g Heat Released: kJ

## Enthalpy of Reaction

[2ΔHf(TlI (s)) + 1ΔHf(Na2SO4 (aq))] - [1ΔHf(Tl2SO4 (aq)) + 2ΔHf(NaI (aq))]
[2(-123.85) + 1(-1389.47)] - [1(-898.47) + 2(-295.29)] = -148.12 kJ
-148.12 kJ     (exothermic)

## Entropy Change

[2ΔSf(TlI (s)) + 1ΔSf(Na2SO4 (aq))] - [1ΔSf(Tl2SO4 (aq)) + 2ΔSf(NaI (aq))]
[2(127.61) + 1(138.08)] - [1(271.08) + 2(170.29)] = -218.36 J/K
-218.36 J/K     (decrease in entropy)

## Free Energy of Reaction (at 298.15 K)

From ΔGf° values:
[2ΔGf(TlI (s)) + 1ΔGf(Na2SO4 (aq))] - [1ΔGf(Tl2SO4 (aq)) + 2ΔGf(NaI (aq))]
[2(-125.39) + 1(-1268.43)] - [1(-809.43) + 2(-313.49)] = -82.8 kJ
-82.80 kJ     (spontaneous)

From ΔG = ΔH - TΔS:
-83.02 kJ     (spontaneous)

## Equilibrium Constant, K (at 298.15 K)

3.2117339361e+014
This process is favorable at 25°C.

## Reference(s):

Kotz, John C., Treichel, Paul, and Weaver, Gabriela. Chemistry & Chemical Reactivity 6th ed.; Thomson Brooks/Cole: Belmont, CA, 2006; p 168.