2. Calculate the enthalpy change to be expected for the reaction NaCl(s) → NaCl(aq) where (s) and (aq) mean solid and aqueous, respectively. Use Hess's law, one of the three enthalpy changes that was measured in this experiment, and the data from the following table. Reaction* AH (kJ/mol) 1/2H;(g) + 1/2Cl;(g) → HCl(g) -92.3 -426.8 Na(s) + 1/20:(g) + 1/2H;(g) → NaOH(s) Na(s) + 1/2Cl:(g) → NaCl(s) -285.8 HC(g) → HC(aq) -75.2 NaOH(s) –→ NaOH(aq) -41.8 * (g) - gas, (1) = liquid, (s) = solid, and (aq) = aqueous. Calculations:

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2.
Copyright All May not he scaned, or in or in part. Due to party may te from the eChapterrs)
Editer inl review has deemed thut any nct the the to ramove al any if equare it
O 2013 All May not be or or toa website, in or in part.
132
Experiment 6
Questions
1. а.
NaOH + NH,C→NaCl + NH3+ H,O
h Compare your experimental value with the one you have just calculated. The correct value is
only -39 kJ/mol. Try to explain any discrepancy between the experimental and calculated
values and between these values and the correct value.
Calculate the enthalpy change to be expected for the reaction
NaCl(s) → NaCl(aq)
where (s) and (aq) mean solid and aqueous, respectively. Use Hess's law, one of the three
enthalpy changes that was measured in this experiment, and the data from the following table.
Reaction*
AH (kJ/mol)
1/2H¿(g) + 1/2C½(g) → HCl(g)
-92.3
Na(s) + 1/2O2(g) + 1/2H2( g) → NaOH(s)
-426.8
Na(s) + 1/2C12(g) – NaCl(s)
-411.1
-285.8
HCl(g) → HCl(aq)
()O'H- (3)F07/I + (8)*H
-75.2
NaOH($) — NaOН ад)
-41.8
* (g) = gas, (1) = liquid, (s) = solid, and (aq) = aqueous.
%3D
%3D
%3D
Calculations:
Transcribed Image Text:2. Copyright All May not he scaned, or in or in part. Due to party may te from the eChapterrs) Editer inl review has deemed thut any nct the the to ramove al any if equare it O 2013 All May not be or or toa website, in or in part. 132 Experiment 6 Questions 1. а. NaOH + NH,C→NaCl + NH3+ H,O h Compare your experimental value with the one you have just calculated. The correct value is only -39 kJ/mol. Try to explain any discrepancy between the experimental and calculated values and between these values and the correct value. Calculate the enthalpy change to be expected for the reaction NaCl(s) → NaCl(aq) where (s) and (aq) mean solid and aqueous, respectively. Use Hess's law, one of the three enthalpy changes that was measured in this experiment, and the data from the following table. Reaction* AH (kJ/mol) 1/2H¿(g) + 1/2C½(g) → HCl(g) -92.3 Na(s) + 1/2O2(g) + 1/2H2( g) → NaOH(s) -426.8 Na(s) + 1/2C12(g) – NaCl(s) -411.1 -285.8 HCl(g) → HCl(aq) ()O'H- (3)F07/I + (8)*H -75.2 NaOH($) — NaOН ад) -41.8 * (g) = gas, (1) = liquid, (s) = solid, and (aq) = aqueous. %3D %3D %3D Calculations:
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