1.

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

Answer»

52 J , 49. 5 J
520 J , 495 J
49.5 J, 52 J
495 J , 520 J

Solution :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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