What is the value of Electron gain enthalpy of Na+, if IE1 of Na=5.1eV .
A
10.2eV
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B
−10.2eV
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C
−5.1eV
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D
5.1eV
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Solution
The correct option is C−5.1eV Ionistion enthalpy is defined as the energy required to remove an electron from an isolated gasous atom. Na(g)→Na+(g)+e−
Electron gain enthalpy is defined as the enthalpy change when an electron is added to isolated gaseous atom. Na+(g)+e−→Na(g)
Therefore, the value of electron gain enthalpy of Na+ is equal to ionisation enthalpy of Na in magnitude but not sign.