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The ionisation enthalpy of sodium is 495...

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?

A

24.75 J

B

49.5 J

C

99 J

D

23 J

Text Solution

Verified by Experts

The correct Answer is:
B
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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