Goal: 1/2 Cl 2 (g)+NaBr(s)-->NaCl(s)+1/2Br 2 (s) 1.CaO(s)+Cl 2 (g)-->CaOCl 2 (s)

Question

Goal: 1/2 Cl2(g)+NaBr(s)-->NaCl(s)+1/2Br2 (s) 1.CaO(s)+Cl2(g)-->CaOCl2(s)                                                           -110.9kJ 2. H2O(l)+CaOCl2(s)+2NaBr(s)-->2NaCl(s)+Ca(OH)2(s)+Br2(l)      -60.2kJ 3.Ca(OH)2(s)--->CaO(s)+H2O(l)                                                        +65.1kJ Goal: 1/2 Cl2(g)+NaBr(s)-->NaCl(s)+1/2Br2 (s) 1.CaO(s)+Cl2(g)-->CaOCl2(s)                                                           -110.9kJ 2. H2O(l)+CaOCl2(s)+2NaBr(s)-->2NaCl(s)+Ca(OH)2(s)+Br2(l)      -60.2kJ 3.Ca(OH)2(s)--->CaO(s)+H2O(l)                                                        +65.1kJ

Explanation / Answer

CaO(s)+Cl2(g)-->CaOCl2(s)                                                         :H 1= -110.9kJ   ----(1) H2O(l)+CaOCl2(s)+2NaBr(s)-->2NaCl(s)+Ca(OH)2(s)+Br2(l)   : H 2 =  -60.2kJ   ---(2) Ca(OH)2(s)--->CaO(s)+H2O(l)                                                      :H3 = +65.1kJ    ---(3) 1/2 Cl2(g)+NaBr(s)-->NaCl(s)+1/2 Br2(s)     : H =?      ----- ( 4) Eq(4 ) can be obtained by the folloeing sequence Eq(4) = (1/2) *{ Eq(1) + Eq(2) + Eq(3) } H    = (1/2) * { H1 + H 2 +H 3 }          = - 53.0KJ

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