The first ionization potential of gaseous Sodium () is . What is the exact value of the electron gai — Periodic Table and Periodicity Chemistry Question
Question
The first ionization potential of gaseous Sodium ($Na$) is $+5.1 \text{ eV}$. What is the exact value of the electron gain enthalpy ($\Delta_{eg}H$) of the gaseous $Na^+$ ion?
Answer: B
💡 Solution & Explanation
The ionization of $Na$ is $Na \rightarrow Na^+ + e^- \ (\Delta H = +5.1 \text{ eV})$. The electron gain of $Na^+$ is the exact reverse process. By Hess's law, $\Delta_{eg}H = -5.1 \text{ eV}$.
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