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Which of the following has a AH 0 kJ/mot? Cl(aq) Oslo) NH3(aq) CO2(g)
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Answer #1

All elements in their standard states have ∆Hf = 0 because there is no change involved in their formation.Their initial states are their final states.But in the case of compounds,the initial reactants are different so there exist some change which leads to evolution of enthalpy.

Here,standard state of Chlorine is Cl2,O3 is made up by splitting of standard O2,NH3 requires N2 and H2 in their formation and CO2 is formed by carbon and oxygen.So the only elemental state here is of I2

So the correct option is (b) I2(s)

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