The electron gain enthalpy of a hypothetical element \( \mathrm{P} ...

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The electron gain enthalpy of a hypothetical element
\( \mathrm{P} \) ' \( \mathrm{A} \) ' is \( -3 \mathrm{eV} \) per atom. How much energy in kCal is

WV released when \( 10 \mathrm{~g} \) of ' \( \mathrm{A} \) ' are completely converted to \( \mathrm{A}^{-} \)ions in gaseous state ?
(Take : \( 1 \mathrm{eV} \) per atom \( =23 \mathrm{kCal} \mathrm{mol}^{-1} \),
Molar mass of \( \mathrm{A}=30 \mathrm{~g} \) )
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