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

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

  • Option 1)

    -5.1 eV

  • Option 2)

    -10.2 eV

  • Option 3)

    +2.55 eV

  • Option 4)

    +10.2 eV

 

Answers (1)

best_answer

As learnt in

Electron gain enthalpy -

When an electron is added to a neutral gaseous atom (x) to convert it into a negative ion, the enthalpy change accompanying the process is defined as the electron gain enthalpy 
(\Delta_{eg}H^\circleddash )

-

 

 Na \overset{\Delta }{\rightarrow}Na^{+}+1e^{-}, \ IE_{1} = 5.1\ eV

\therefore  for the reverse reaction,

Na^{+}+1e^{-}\rightarrow Na, \ \Delta H=-5.1\ eV

Where \Delta H  = Electron gain enthalpy


Option 1)

-5.1 eV

This option is correct

Option 2)

-10.2 eV

This option is incorrect

Option 3)

+2.55 eV

This option is incorrect

Option 4)

+10.2 eV

This option is incorrect

Posted by

divya.saini

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