1.

Ionisation enthalpy of litium is520kJ"mol"^(-1) How much energy in joules must be needed to convert all atoms of lithium to ions present in 7 mg of lithium vapours?

Answer»

74.3 J
260J
520J
780J

Solution :Energy needed for the ionisation of 7 g of Li=520 KJ
Energy needed for the ionisation of `7xx10^(-3)g` of Li VAPOUR `=520/7xx7xx10^(-3)=520J`


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