In fact, there is a difference between them which relates to the conditions under which they are calculated. Lattice enthalpy and lattice energy are commonly used as if they mean exactly the same thing - you will often find both terms used within the same textbook article or web site, including on university sites. But to say it is not entirely true because the problem lies in how the text define lattice energy whether is lattice forming or breaking and thus the sign would differ.Īluminium oxide born haber process. I believe the confusion is that actually there are two types of lattice energy - Lattice Forming and Lattice breaking. Thanks, Does this mean that I should multiply this equation: 1. Have I missed anything out? It is good to write out each enthalpies chemical equation before doing its math.
Now we have 2Al g The first, second and third ionisation energies of aluminium are:, and kJ mol -1 respectively. In the Born-Haber cycles below, I have used numbers which give a consistent answer, but please don't assume that they are necessarily the most accurate ones. Unless you go on to do chemistry at degree level, the difference between the two terms isn't likely to worry you.
However, the difference is small, and negligible compared with the differing values for lattice enthalpy that you will find from different data sources.
0 kommentar(er)
