How much energy will be released when a sodium ion and a chloride ion, originally at infinite distance are brought together to a distance of ` 2. 76 Å` ( the shortest distance fo approach in a sodium chloride crystal ? Assume that the ions act as point charges , each with a mangitude of ` 1. 60 xx 10^(-19) C` ( the electronic charge ) Also if lattice enrgy of Nacl is ` 185 ` kcal , how the lower value obtained per mole by above calculation can be explained ?

Explanation

119.595 kcal ,