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The salt cesium sulfate dissolves in water according to the reaction: Cs2SO4(s) = 2Cs+(aq) + SO42-(aq)...

The salt cesium sulfate dissolves in water according to the reaction:

  • Cs2SO4(s) = 2Cs+(aq) + SO42-(aq)


(a) Calculate the standard enthalpy change ΔH° for this reaction, using the following data:

  • Cs2SO4(s) = -1443.0 kJ mol-1
    Cs+(aq) = -258.3 kJ mol-1
    SO42-(aq) = -909.3 kJ mol-1
  • (b) Calculate the temperature reached by the solution formed when 136 g of Cs2SO4 is dissolved in 0.122 L of water at 22.4 °C. Approximate the heat capacity of the solution by the heat capacity of 122 g of pure water (specific heat capacity = 4.18 J g-1 °C-1), ignoring the mass of the salt.
  • (c) Heats of reaction find practical application in hot packs or cold packs. Would this dissolution reaction be appropriate for the preparation of a hot pack or a cold pack?
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Answer #1


S cag 2 Cs ca Cs, so Cs) AH(2x-258 3-01.3)-(-14430) 14-1 KTI AH 136 Cs, s04 mas molus oCs,S 136 -6- 3 758 mo 362 6.4265 = Cp

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