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The electron affinity of a hypothetical ...

The electron affinity of a hypothetical element `'A'` is `3eV` per atom. How much energy in kcal is released when `10g` of `'A'` is completely converted of `A^(-)` ion in a gaseous state ?
`(1 eV=23" kcal mol"^(-1)`, Molar mass of `A=30g)`

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