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

Question

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

Tardigrade Admin · Accepted Answer

underset30A + e arrow underset3× 23 kcalA- + 3 eV ∴ Energy released for conversion of 10 g gaseous A into A -ions =(3 × 23/30) × 10=23 kcal

Q. The electron affinity of a hypothetical element ' $A$ ' is $3 e V$ per atom. How much energy (in kcal) is released when $10 g$ of ' $A$ ' is completely converted into $A^{-}$ ion in a gaseous state?
$(1 e V = 23 k c a l m o l^{- 1}$ , Molar mass of $A = 30 g)$

$30 A + e \to 3 \times 23 k c a l A^{-} + 3 e V$
$∴$ Energy released for conversion of $10 g$ gaseous $A$ into
$A^{-}$ ions $= \frac{3 \times 23}{30} \times 10 = 23 k c a l$

Q. 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 into A−ion in a gaseous state? (1eV=23kcalmol−1, Molar mass of A=30g)

30A​+e→3×23kcalA−+3eV​ ∴ Energy released for conversion of 10g gaseous A into A−ions =303×23​×10=23kcal

Q. The electron affinity of a hypothetical element ' $A$ ' is $3 e V$ per atom. How much energy (in kcal) is released when $10 g$ of ' $A$ ' is completely converted into $A^{-}$ ion in a gaseous state?
$(1 e V = 23 k c a l m o l^{- 1}$ , Molar mass of $A = 30 g)$

$30 A + e \to 3 \times 23 k c a l A^{-} + 3 e V$
$∴$ Energy released for conversion of $10 g$ gaseous $A$ into
$A^{-}$ ions $= \frac{3 \times 23}{30} \times 10 = 23 k c a l$