Bond Strength (2)

Bond Order Length Strength

HO—OH 1 149 pm 210 kJ/mol

O=O 2 121 498 kJ/mol

1.5 128 ?

HOW TO CALCULATE ?

?Hrxn = {3x?Hf(O) - ?Hf(O3)} = {3x249.2 - 142.7} = 605 kJ/mol

2 O-O bonds in O3 ? DE (O3) = 605/2 = 302.5 kJ/mol

O3 (g) ? 3 O(g)

303 kJ/mol

Previous slide

Next slide

Back to first slide

View graphic version