![]() ![]() #color(blue)(DeltaH_"lattice" -= -|DeltaH_"lattice"|)# Solving for #DeltaH_"lattice"# usually gives a positive answer, so we take the negative of the answer by convention to get: Take the step as being upwards to generate a complete cycle, for which #DeltaH_"cycle" = 0# (since #H_f = H_i# for a complete cycle). #"These cancel out completely upon adding, proving"#Īnd now if we wish, the lattice energy can be calculated. Put this all together, with some data, and we get, for #"1 mol"# of #"NaCl"(s)#:
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