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| Reaction | Energy Change (in $kJ$ ) |
| $Li(s) \to Li(g)$ | $161$ |
| $Li(g) \to Li^+(g)$ | $520$ |
| $\frac {1}{2}F_2(g)\,\to F(g)$ | $77$ |
| $F(g) + e^- \to F^-(g)$ | (Electron gain enthalpy) |
| $Li^+ (g) + F^-(g) \to LiF(s)$ | $-1047$ |
| $Li (s) + \frac {1}{2}F_2(g)\to LiF(s)$ | $-617$ |
Based on data provided, the value of electron gain enthalpy of fluorine would be.....$kJ\,mol^{-1}$
$HCl_{ ( g )}$ are $-105,-242,-394$ and $-92\,kJ\,mol ^{-1}$
respectively. The magnitude of enthalpy of the reaction given below is $......kJ\,mol ^{-1}$
(nearest integer) $CCl _{4( g )}+2 H _2 O_{( g )} \rightarrow CO _{2( g )}+4 HCl_{( g )}$
$\Psi_{2 s}=\frac{1}{2 \sqrt{2 \pi}}\left(\frac{1}{a_0}\right)^{1 / 2}\left(2-\frac{ r }{ a _0}\right) e ^{- r / 2 a _0}$
At $r=r_0$, radial node is formed. Thus, $r_0$ in terms of $a_0$