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The first ionisation potential of Li is ...

The first ionisation potential of Li is `5.4` e V and the electron affinity of Cl is 3.6 eV . Calculate `Delta H` in kcal `mol^(-1)` for the reaction
`Li (g) + Cl (g) to Li^(+) + Cl^(-)`
Carried out at such low pressures that resulting ions do not combine with each other.

A

`70 `

B

`100`

C

`170 `

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) = 172.5 kJ mol^(-1)`
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