1.

The ionisation enthalpy of sodium is 495 kJ "mol"^(-1). How much energy is needed to convert atoms present in 2.3 mg of sodium to sodium ions?

Answer»

24.75 J
49.5 J
99 J
23 J

Solution :I.E. `=495kJ"MOL"^(-1)`
ENERGY needed to ionize(1 mol) 23 g of SODIUM vapiur `=495kJ`
Energy needed to ionize `2.3xx10^(-3)g` of sodium vapour `=495/23xx 2.3xx10^(-3)=49.5J`


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