The first ionization energy for Li is 5.4 ,eV and electron affini… - Vidyadip

MCQ

The first ionization energy for Li is $5.4 \,eV $ and electron affinity of $Cl$ is $3.61\,eV.$ The $\Delta H$ (in $kJ/mol$) for the reaction $Li(g) + Cl(g) \to L{i^ + } + C{l^ - }$ is (if resulting ions do not combine with each other) $(1\,eV = 1.6 \times {10^{ - 19}}\,J)$

A
$70$
B
$100$
✓
$170$
D
$270$

✓

Answer

Correct option: C.

$170$

(c)First ionization potential of $Li = 5.4\,eV$
Electron affinity of $Cl = 3.61\,eV$
We have $\Delta H = I.P. - E.A.$
$ = 5.4 - 3.61 = 1.80\,eV = 1.80 \times 1.6 \times {10^{ - 22}}\,kJ$
$\Delta H = 2.86 \times {10^{ - 22}}\,kJ,$
for $ 1\,mol$ Avogadro’s number $ = 6.02 \times {10^{23}}$.
$\Delta H = 2.86 \times {10^{ - 22}} \times 6.02 \times {10^{23}} = 170\,kJ/mole.$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from 5. Thermodynamics and thermochemistry→5. Thermodynamics and thermochemistry — all question types→Chemistry STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

Which of the following is the weakest acid

Total number of secondary amines (Excluding stereo isomer) possible with the molecular formula $C_5H_{13}N$ is

The heat liberated when $ 1.89 \,g$ of benzoic acid is burnt in a bomb calorimeter at ${25\,^o}C$ increases the temperature of $ 18.94\, kg $ of water by ${0.632\,^o}C$.If the specific heat of water at ${25\,^o}C$ is $0.998\, cal/g-deg$, the value of the heat combustion of benzoic acid is ....$kcal$

If the bond dissociation energies of $XY,\,{X_2}$ and ${Y_2}$ (all diatomic molecules) are in the ratio of $1 : 1 : 0.5 $ and ${\Delta _f}H$ for the formation of $XY$ is $ - 200\,kJ\,mol{e^{ - 1}}$. The bond dissociation energy of ${X_2}$ will be.....$kJ\,mo{l^{ - 1}}$

Number of optical isomers possible for $2$ - chlorobutane..........

The number of electrons in $C{l^ - }$ ion is

For the energy levels in an atom, which one of the following statements is correct

The decreasing order of size of isoelectronic series ${K^ + },\,C{a^{2 + }},\,C{l^ - }$ and ${S^{2 - }}$ is

$ng$ of substance $X$ reacts with $mg$ of substance $Y$ to form $pg$ of substance $R$ and $qg$ of substance $S$. This reaction can be represented as, $X + Y \rightarrow R + S$. The relation which can be established in the amounts of the reactants and the products will be