Question
Define electron gain enthalpy. What are its units?
✓
Answer
The energy which is released by an isoated gaseous atom in gaining an electron from outside atom or ion to form negative ion (or anion) is called electron gain enthalpy $(\Delta e g H)$. Unit of electron gain enthalpy is $kJ / mol$.
In some cases like in noble gas atoms do not have any attraction to gain an electron in that case energy has to be supplied.
For example
$\begin{aligned} & N e(g)+e^{-} \rightarrow N e^{-}(g) \\ & \Delta e g H=+116 k J mol^{-1}\end{aligned}$
In some cases like in noble gas atoms do not have any attraction to gain an electron in that case energy has to be supplied.
For example
$\begin{aligned} & N e(g)+e^{-} \rightarrow N e^{-}(g) \\ & \Delta e g H=+116 k J mol^{-1}\end{aligned}$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
→→→→→→
$\text{X(g)}+3\text{Y(g)}\rightleftharpoons2\text{Z(g)};$ $\Delta\text{H}=-40\text{kJ}$ and so of X, Y and Z are 60, 40 and 50kJ-1 mol-1 respectively. Calculate the temperature above or below which reaction become feasible?
→What is the value of equilibrium constant for the following reaction at 400K?
→$2\text{NOCl(g)}\rightleftharpoons2\text{NO(g)}+\text{Cl}_2(\text{g})$
$\Delta\text{H}^\circ=77.5\text{kJ mol}^{-1},$ $\text{R}=8.314\text{J mol}^{-1}\text{K}^{-1},$ $\Delta\text{S}=135\text{J K}^{-1}\text{mol}^{-1}.$
2 Arrange the following set of compounds in order of their decreasing relative reactivity with an electrophile, E+.
Chlorobenzene, 2,4-dinitrochlorobenzene, p-nitrochlorobenzene.
Chlorobenzene, 2,4-dinitrochlorobenzene, p-nitrochlorobenzene.
Balance the following equations by the oxidation number method.
$\text{I}_2+\text{S}_2\text{O}^{2-}_3\xrightarrow{ \ \ \ \ \ \ }\text{I}^-+\text{S}_4\text{O}^{2-}_6$
→$\text{I}_2+\text{S}_2\text{O}^{2-}_3\xrightarrow{ \ \ \ \ \ \ }\text{I}^-+\text{S}_4\text{O}^{2-}_6$
The amount of energy released when 1 × 1010 atoms of chlorine in vapour state are converted to Cl- ions according to the equation,
Cl(g) + e- → Cl-(g) is 57.86 × 10-10J
Calculate the electron gain enthalpy of chlorine atom in terms of kJ mol-1 and eV per atom.
Cl(g) + e- → Cl-(g) is 57.86 × 10-10J
Calculate the electron gain enthalpy of chlorine atom in terms of kJ mol-1 and eV per atom.
- Give one example of position isomerism.
- What are electrophiles? Give one example of electrophilic substitution reaction.
- Write the chemistry of Lassaigne's test for qualitative analysis of nitrogen.
$K_p=0.04 atm$ at 899 K for the equilibrium shown below. What is the equilibrium concentration of $C _2 H _6$ when it is placed in a flask at 4.0 atm pressure and allowed to come to equilibrium?
$
C_2 H_6(g) \rightleftharpoons C_2 H_4(g)+H_2(g)
$
→$
C_2 H_6(g) \rightleftharpoons C_2 H_4(g)+H_2(g)
$
Consider the reactions: O3(g) + H2O2(l) → H2O(l) + 2O2(g)
Why it is more appropriate to write these reactions as:
O3(g) + H2O2(l) → H2O(l) + O2(g) + O2(g)
Also suggest a technique to investigate the path of the above redox reactions.An alkyl halide (X) of formula C3H13Cl on treatment with alcoholic KOH or potassium tert-butoxide gives two isomeric alkenes Yand Z(C6H12). Both alkenes on hydrogenation give 2, 3-dimethylbutane. Predict the structure of X, Y and Z.