Use the Data Given Below to Construct a Born-Haber Cycle

Use the data given below to construct a Born-Haber cycle to determine the electron affinity of Br.
$$\begin{array} { l c } &\mathrm {Delta H ^ { \circ } \left( \mathrm { kJ } \mathrm { mol } ^ { - 1 } \right) } \\\mathrm { K } ( s ) \rightarrow \mathrm { K } ( g ) &89 \ \\\mathrm {~K} ( g ) \rightarrow \mathrm { K } ^ { + } ( g ) + \mathrm { e } ^ { - } & 419 \\\mathrm { Br } 2 ( g ) \rightarrow 2 \mathrm { Br } ( g ) & 193 \\\mathrm {~K} ( s ) + \frac { 1 } { 2 } \operatorname { Br } 2 ( g ) \rightarrow \mathrm { KBr } ( s ) & - 394 \\\mathrm { KBr } ( s ) \rightarrow \mathrm { K } ^ { + } ( g ) + \mathrm { Br } ^ { - } ( g ) & 674\end{array}$$

A) -885 kJ mol^-1
B) -325 kJ mol^-1
C) +367 kJ mol^-1
D) -464 kJ mol^-1
E) +246 kJ mol^-1

Correct Answer:

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