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    4. Ionization And Electron Gain Enthalpy MCQ - Practice Questions with Answers

    Ionization And Electron Gain Enthalpy MCQ - Practice Questions with Answers

    Edited By admin | Updated on Sep 25, 2023 25:23 PM | #NEET

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    • 3 Questions around this concept.

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    What is the value of electron gain enthalpy Na+ if IE1 of Na = 5.1 eV?

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    What is the value of electron gain enthalpy of Na+ if IE1 of Na = 5.1 eV?

    View Solution

    Concepts Covered - 1

    Ionization And Electron Gain Enthalpy

    Ionization Energy and Electron Affinity

    Ionization energy and electron affinity are defined at absolute zero. At any other temperature, heat capacities for the reactants and the products have to be taken into account.

    \begin{array}{l}{\mathrm{M}(\mathrm{g}) \rightarrow \mathrm{M}^{+}(\mathrm{g})+\mathrm{e}^{-} \text {(for ionization) }} \\ {\mathrm{M}(\mathrm{g})+\mathrm{e}^{-} \rightarrow \mathrm{M}^{-}(\mathrm{g}) \text { (for electron gain) }}\end{array}

    at temperature, T is

    \Delta_{r} H^{\ominus}(T)=\Delta_{r} H^{\ominus}(0)+\int_{0}^{T} \Delta_{r} C_{p}^{\ominus} d T

    The value of Cp for each species in the above reaction is 5/2 R (CV = 3/2R)

    \begin{aligned} \text { So, } \Delta_{r} C_{p}^{\ominus} &=+5 / 2 \mathrm{R} \text { (for ionization) } \\ \Delta_{I} C_{p}^{\ominus} &=-5 / 2 \mathrm{R} \text { (for electron gain) } \end{aligned}

    Therefore,

    \begin{array}{l}{\Delta_{r} H^{\ominus}(\text { ionization enthalpy })} {=E_{0}(\text { ionization energy })+5 / 2 \mathrm{RT}} \\ {\Delta_{r} H^{\ominus}(\text { electron gain enthalpy) }} {=-\mathrm{A}(\text { electron affinity) }-5 / 2 \mathrm{RT}}\end{array}

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    Ionization And Electron Gain Enthalpy

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    Ionization And Electron Gain Enthalpy Current Topic

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    Thermodynamic Property
    State Functions
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    Zeroth Law Of Thermodynamics
    Introduction To Heat, Internal Energy And Work
    First Law of Thermodynamics
    Isothermal Expansion of an Ideal Gas
    Adiabatic Process
    Graphical Comparison of Thermodynamic Processes

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    Ionization And Electron Gain Enthalpy

    Chemistry Part I Textbook for Class XI

    Page No. : 179

    Line : 40

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