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The ionization enthalpies of lithium and...

The ionization enthalpies of lithium and sodium are `520 kJ mol^(-1)` and `495 kJ mol^(-)` respectivley . The energy required to convert all the atoms present in 7 mg of lithium vapours and 23 mg of sodium vapours of their respective gaseous cations respectivley are

A

52 J , 49. 5 J

B

520 J , 495 J

C

49.5 J, 52 J

D

495 J , 520 J

Text Solution

Verified by Experts

The correct Answer is:
B
No. of moles of `Li = 7/(1000 xx 7) = 10^(-3)`
No. of moles of `Na = 23/(1000 xx 23) = 10^(-3)`
The amounts of energies required for `10^(-3)` mole each of Li and Na are `520 kJ xx 10^(-3) and 495 kJ xx 10^(-3)` or 520 J and 495 J respectively.
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