Answer to Question #120793 in Inorganic Chemistry for Lontum Rodrique

Question #120793
The common oxidation number for an alkaline earth metal is +2. Using the Born–Mayer equation and a Born–Haber cycle, show that CaCl is an exothermic compound. Use a suitable analogy to estimate an ionic radius for Ca+. The sublimation enthalpy of Ca(s) is 176 kJmol-1. Show that an explanation for the nonexistence of CaCl can be found in the enthalpy change for
the reaction 2 CaCl(s) → Ca(s) + CaCl2(s).
1
Expert's answer
2020-06-08T15:45:13-0400

continuation:

Then ΔHf= < 0 - an exothermic process

Thus we show that CaCl is an exothermic compound.

for the reaction 2 CaCl(s) → Ca(s) + CaCl2(s).

- exotermic. Thus nonexistent CaCl would decompose spontaneously to CaCl2 and Ca.


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