The bond dissociation energies of , , and are observed to be in the ratio 1:0.5:1. If the standard enthalpy of formation for is -200 kJ/mol, what is the exact bond dissociation energy of ?

Question

The bond dissociation energies of $X_2$, $Y_2$, and $XY$ are observed to be in the ratio 1:0.5:1. If the standard enthalpy of formation for $XY$ is -200 kJ/mol, what is the exact bond dissociation energy of $X_2$?

Prashant Kotian · Accepted Answer

Correct answer: A. Let the bond energies be , , and . The formation reaction is . . Setting yields kJ/mol.

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