Answer to Question #87145 in General Chemistry for mike

Question

The salt cobalt(II) sulfate dissolves in water according to the reaction:
CoSO4(s) Co2+(aq) + SO42-(aq)

(a) Calculate the standard enthalpy change ΔH° for this reaction, using the following data:
CoSO4(s) = -888.3 kJ mol-1
Co2+(aq) = -58.2 kJ mol-1
SO42-(aq) = -909.3 kJ mol-1

_____ kj.

(b) Calculate the temperature reached by the solution formed when 12.4 g of CoSO4 is dissolved in 0.135 L of water at 22.2 °C. Approximate the heat capacity of the solution by the heat capacity of 135 g of pure water (specific heat capacity = 4.18 J g-1 °C-1), ignoring the mass of the salt.

________ C

(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?

Hot pack or Cold pack?

Answer 1

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