CAIE A-Level Chemistry A2 23.2.3 Calculations the Energy Cycles in 23 2 2 Topic Practice

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Question 1

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Potassium iodide, KI, is used as a reagent in both inorganic and organic chemistry.

Table 1.1 gives some data about the halide ions, Cl−,Br−\mathrm{Cl}^{-}, \mathrm{Br}^{-}and I−\mathrm{I}^{-}, and their potassium salts.

Table 1.1

Table 1.1

The enthalpy change of solution of KI(s) is +21.0 kJ mol−1+21.0 \mathrm{~kJ} \mathrm{~mol}^{-1}.

Use this information and the data in Table 1.1 to calculate the enthalpy change of hydration of the potassium ion, K+(g)\mathrm{K}^{+}(\mathrm{g}).

ΔHhyd  of K+(g)=……………………………………..kJ mol−1\Delta H_{\text {hyd }} \text { of } \mathrm{K}^{+}(\mathrm{g})=\ldots \ldots \ldots \ldots \ldots \ldots \ldots \ldots \ldots \ldots \ldots \ldots \ldots \ldots . . \mathrm{kJ} \mathrm{~mol}^{-1}
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