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The value of DeltaH^(@) for the reaction...

The value of `DeltaH^(@)` for the reaction `Cu^(+)(g)+I^(-)(g)toCuI(g)` is -446kJ `mol^(-1)`. If the ionisation energy of `Cu(g)` is 745 kJ `mol^(-1)` and the electron affinity of I(g) is -295 kJ `mol^(-1)`, then the value of `DeltaH^(@)` for the formation of one mole of CuI(g) from Cu(g) and I(g) is:

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`{:(Cu(g) rarr Cu^(+) (g) + e, , Delta H = 745 kJ mol^(-1)),( I(g) + e rarr I^(-) (g) ,, Delta H = -295 kJ mol^(-1)),("Adding"Cu^(+) (g) + I^(-)(g) rarr CuI(g), , DeltaH^(@) = -446 kJ mol^(-1)):}/(Cu(g) + I(g) rarr CuI(g),DeltaH^(@) = 4kJ mol^(-1))`
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