The bond enthalpy of the oxygen-oxygen bond in o2 is 498 kj/mol. based on the enthalpy of the reaction represented above, what is the average bond enthalpy, in kj/mol, of an oxygen-oxygen bond in o3?

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1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.