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Calculate the Standard Enthalpy of Formation of Potassium Chloride Given

Question 76

Essay

Calculate the standard enthalpy of formation of potassium chloride given the following enthalpy data.
K(s)K(g)+89 kJmol1 K( g)K+(g)+e+418 kJmol11/2Cl2( g)Cl(g)+122 kJmol1Cl(g)eCl(g)349 kJmol1KCl(s)K+(g)+Cl(g)+717 kJmol1\begin{array} { l l } \mathrm { K } ( \mathrm { s } ) \rightarrow \mathrm { K } ( \mathrm { g } ) & + 89 \mathrm {~kJ} \cdot \mathrm { mol } ^ { - 1 } \\\mathrm {~K} ( \mathrm {~g} ) \rightarrow \mathrm { K } ^ { + } ( \mathrm { g } ) + \mathrm { e } ^ { - } & + 418 \mathrm {~kJ} \cdot \mathrm { mol } ^ { - 1 } \\1 / 2 \mathrm { Cl } _ { 2 } ( \mathrm {~g} ) \rightarrow \mathrm { Cl } ( \mathrm { g } ) & + 122 \mathrm {~kJ} \cdot \mathrm { mol } ^ { - 1 } \\\mathrm { Cl } ( \mathrm { g } ) \mathrm { e } ^ { - } \rightarrow \mathrm { Cl } ^ { - } ( \mathrm { g } ) & - 349 \mathrm {~kJ} \cdot \mathrm { mol } ^ { - 1 } \\\mathrm { KCl } ( \mathrm { s } ) \rightarrow \mathrm { K } ^ { + } ( \mathrm { g } ) + \mathrm { Cl } ^ { - } ( \mathrm { g } ) & + 717 \mathrm {~kJ} \cdot \mathrm { mol } ^ { - 1 }\end{array}

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-437 kJ.mo...

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