Calculate the energy (in kJ unit) required to convert all sodium atoms into sodium ion, present in 3.45 mg of its vapour ? (I.P of sodium 490kJ `mol^(-1)`)

Explanation

Sodium atoms present`=(3.45)/(23)xx10^(-3)=1.5xx10^(-4)`mol
`Na(g)+I_(1)=Na^(+)(g)+e,E=490kJ*mol^(-1)`
Energy required for ionisation of 1 mol sodium is 490 kJ.
Energy required for ionisation of `1.5xx10^(-4)` mol sodium is `490xx1.5xx10^(-4)kJ=73.51`.