First slide

Periodicity in atomic properties

Question

$X_{(g)}^{+} \to X_{(g)} \to X_{(g)}^{-};$
$ΔH$ for the entire process -1600 kJ/mole.If IP of ‘X' is 1260 kJ/mole then Electron gain enthalpy of ‘X’ would be

Difficult

A

+2860 kJ/mole
B

+340 kJ/mole
C

–340kJ/mole
D

–2860 kJ/mole

Solution

$Given X_{(g)} \to X_{(g)}^{+}, ΔH = + 1260 kJ$
$∴ X_{(g)}^{+} \to X_{(g)} ΔH = - 1260 kJ / mole$
$X_{(g)}^{+} \overset{- 1260}{\to} X_{(g)} \overset{{ΔH}_{2}}{\to} X_{(g)}^{-}$
$- 1260 + ∆ H_{2} = - 1600$
${ΔH}_{2} = - 340 kJ / mole$

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