Use the _DfH°° and _DrH°information Provided to Calculate _DfH° for IF

Use the _DfH°° and _DrH°information provided to calculate _DfH° for IF: $$\begin{array} { l c c } & \mathrm { D } _ { \mathrm { f } } H ^ { \circ } \left( \mathrm { kJ } \mathrm { mol } ^ { - 1 } \right) & \mathrm { IF } 7 ( g ) + \mathrm { I } _ { 2 } ( g ) \rightarrow \mathrm { IF } _ { 5 } ( g ) + 2 \operatorname { IF } ( g ) \quad \mathrm { D } _ { \mathrm { r } } H ^ { \circ } = - 89 \mathrm {~kJ} \\\operatorname { IF } _ { 7 } ( g ) & - 941 \\\operatorname { IF } _ { 5 } ( g ) & - 840\end{array}$$

A) 101 kJ mol^-1
B) -146 kJ mol^-1
C) -190.kJ mol^-1
D) -95 kJ mol^-1
E) 24 kJ mol^-1

Correct Answer:

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