Calculate the proton affinity of `NH_(3)` (g) from the following data (in kJ/mol):
`{:(DeltaH^(@)"dissociation":H_(2)(g),=436),(DeltaH^(@)"formation":NH_(3)(g),=-46),("Lattic energyof"NH_(4)Cl(s),=-683),("Ionisation enorgy of"H,=130),("Electron affinity of"Cl,=380),(DeltaH^(@)"dissociation" :Cl_(2)(g),=240),(DeltaH^(@)"formation of"NH_(4)Cl(s),=-314):}`
