According to bond energy tables, the triple bond of N2 is 946 kJ/mol while the b

Question

According to bond energy tables, the triple bond of N2 is 946 kJ/mol while the bond of I2 is 151 kJ/mol. Based on simple chemical ideas about what molecular properties lead to activation energies, it is reasonable to expect that the reaction of H with N2 will have a higher activation energy than the reaction of H with I2.

1. Yes, I2 is heavier than N2.

2. No, bond energies do not matter much; lone pairs are crucial.

3. Yes, in both cases the reactant bond must be stretched by collisions and more energy is required for the stronger bond.

4. Yes, in both cases the reactant bond must be broken before the H can bond.

5. No, activation energies have nothing to do with bond energies.

Explanation / Answer

Answer: No, activation energies have nothing to do with bond energies.

The bond energy is related to enthalpy of reaction. The activation energy is related to kinetic energy and oreintation of molecules which undergo collision to give products.

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