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The first ionisation energy for Li is 5....

The first ionisation energy for Li is `5.4 eV` and electron affinity of `Cl` is 3.61 eV. The `DeltaH` (in kJ/mol) for the reaction, `Li_((g)) + Cl_((g)) to Li_((g))^(+) + Cl_((g))^(+)`
If the resulting ions do not combine with each other is `(1 eV = 1.6 xx 10^(-19) J)`

A

70

B

`100.5`

C

`172.5`

D

`270`

Text Solution

Verified by Experts

The correct Answer is:
C
`DeltaH = (5.4 - 3.61) xx (1.6 xx 10^(-19)J) xx (6.023 xx 10^(23)) xx 10^(-3) = 172.49 kJ mol^(-1)`
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