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CGP EDU Academic Team
Published on: August 14, 2026
The electron gain enthalpy of a hypothetical element ‘A’ is –3 eV per atom. How much energy in kCal is released when 10 g of ‘A’ are completely converted to A – ions in gaseous state ? (Take : 1 eV per atom = 23 kCal mol –1 , Molar mass of A = 30 g)
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(23 )
A + e – ⎯→ A ¯ + 3 eV
Number of mole of A = 10/30.
As 1 mole of A releases the amount of energy = 3 × 23 kcal.
∴ Energy released for conversion of 10/30 mole of gaseous A into A ¯ ions = 
× 10 = 23 kCal
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