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Ionisation enthalpy of litium is 520kJ"...

Ionisation enthalpy of litium is `520kJ"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?

A

74.3 J

B

260J

C

520J

D

780J

Text Solution

Verified by Experts

The correct Answer is:
C
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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