question_answer

The ionization enthalpies of Li and Na are 520 kJ \[mo{{l}^{-1}}\] and 495 kJ \[mo{{l}^{-1}}\] respectively. The energy required to convert all the atoms present in 7 mg of Li vapours and 23 mg of sodium vapours to their respective gaseous captions respectively are

A) \[52\text{ }J,\text{ }49.5\text{ }J\]       

B)     \[520\text{ }J,\text{ }495\text{ }J\]

C) \[49.5\text{ }J,\text{ }52\text{ }J\]       

D)          \[495\text{ }J,\text{ }520\text{ }J\]