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NCI_(3) is an endothermic compound while NF_(3) is an exothermic compound. |
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Answer» Solution :DUE to smaller size of F as compared to CI, the N-F bond is much stronger (272 kJ `mol^(-1)`) than N-CI bond (201 kJ `mol^(-1)`) while bond dissociation energy of `F_(2)` (158.8 kJ `mol^(-1)`) is much lower than that of `CI_(2)` (242.6 kJ `mol^(-1)`). Therefore, ernergy released during the fomation of `NF_(3)` molecule is more than the energy needed to break `N_(2)` (941.4 kJ `mol^(-1)`) and `F_(2)` molecules into individual atoms. In other words, formation of `NF_(3)` is an exothermic REACTION or `NF_(3)` is an exothermic compound. `{:(N_(2)(g)+3F_(2)(g) rarr 2 NF_(3)(g),,""Delta = -214.2 kJ mol^(-1)),(N_(2)(g)+3CI_(2)(g) rarr 2 NCI_(3)(g),,""Delta H = +463.2 kJ mol^(-1)):}` In CONTRAST, energy released during the formation of `NCI_(3)` molecule is less than the energy needed to break `N_(2) and CI_(2)` molecules into individual atoms. In other words, formation of `NCI_(3)` is an endothermic reaction or `NCI_(3)` is an endothermic compound. |
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