6- Using the information below, calculate the value of VHo (in Kilojoules) for the reaction: ½ Cl2 (g) + NaBr (s) ----------------> NaCl (s) + ½ Br2 (l) ?Ho = ? Given thermochemical equations: CaO (s) + Cl2 (g) --------> CaOCl2 (s) ?Ho = - 110.9kJ 2NaCl(s) + Ca(OH)2 (s) + Br2(l) ------->H2O (l) + CaOCl2 (s) + 2NaBr(s) ?Ho = + 60.2kJ Ca(OH)2 (s) -----------> O(s) + H2O (l) ?Ho = + 65.1 kJ
Solution
We can arrange the equations in the following manner
1/2CaO (s) + 1/2Cl2 (g) --------> 1/2CaOCl2 (s) ?Ho = - 55.45 kJ
1/2H2O (l) + 1/2CaOCl2 (s) + NaBr(s) -------> NaCl(s) + 1/2Ca(OH)2 (s) + 1/2Br2(l) ?Ho = + 30.1 kJ
1/2Ca(OH)2 (s) -----------> 1/2CaO(s) + 1/2H2O (l) ?Ho = +32.55 kJ
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½ Cl2 (g) + NaBr (s) ----------------> NaCl (s) + ½ Br2 (l) ?Ho = +7.2 Kj
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6- Using the information below- calculate the value of VHo (in Kilojou.docx
1. 6- Using the information below, calculate the value of VHo (in Kilojoules) for the reaction: ½
Cl2 (g) + NaBr (s) ----------------> NaCl (s) + ½ Br2 (l) ?Ho = ? Given thermochemical
equations: CaO (s) + Cl2 (g) --------> CaOCl2 (s) ?Ho = - 110.9kJ 2NaCl(s) + Ca(OH)2 (s) +
Br2(l) ------->H2O (l) + CaOCl2 (s) + 2NaBr(s) ?Ho = + 60.2kJ Ca(OH)2 (s) -----------> O(s) +
H2O (l) ?Ho = + 65.1 kJ
Solution
We can arrange the equations in the following manner
1/2CaO (s) + 1/2Cl2 (g) --------> 1/2CaOCl2 (s) ?Ho = - 55.45 kJ
1/2H2O (l) + 1/2CaOCl2 (s) + NaBr(s) -------> NaCl(s) + 1/2Ca(OH)2 (s) + 1/2Br2(l) ?Ho = +
30.1 kJ
1/2Ca(OH)2 (s) -----------> 1/2CaO(s) + 1/2H2O (l) ?Ho = +32.55 kJ
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½ Cl2 (g) + NaBr (s) ----------------> NaCl (s) + ½ Br2 (l) ?Ho = +7.2 Kj
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