Which chemical process is associated with the lattice energy for sodium chloride?
nacl(g) → na+(g) + cl-(g)
nacl(s) + h2o(l) → na+(aq) + cl-(aq)
na(s) + 1/2 cl2(g) → nacl(s)
nacl(s) → na+(g) + cl-(g)

I am absolutely sure thathe chemical process which is associated with the lattice energy for sodium chloride is the last option from the scale represented above - NaCl(s) → Na+(g) + Cl-(g). I choose this one because it has to perform reversed process that must release the same energy. 
Do hope you still need the answer because this one is really helpful!