InterviewSolution
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InterviewSolution
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The enthalpy changes of the following reactions at `27^(@)C` are `{:(Na(s)+1/2 Cl_(2) (g) rarr NaCl (s),Delta_(r)H=-411" kJ/mol",),(H_(2)(g)+S(s)+2O_(2)(g) rarr H_(2)SO_(4)(l),Delta_(r)H=-811" kJ/mol",),(2Na(s)+S(s)+2O_(2)(g) rarr Na_(2)SO_(4)(s),Delta_(r)H=-1382" kJ/mol",),(1/2 H_(2)(g)+1/2 Cl_(2)(g) rarr HCl(g),Delta_(r)H=-92" kJ/mol,",R=8.3" J/K-mol"):}` from these data, the heat change of reaction at constant volume (in kJ/mol) at `27^(@)C` for the process `2NaCl (s)+H_(2)SO_(4) (l) rarr Na_(2)SO_(4) (s)+2 HCl (g)` isA. 67B. 62.02C. 71.98D. None |
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Answer» Correct Answer - B `{:(2NaCl(s)rarr 2Na(s)+Cl_(2)(g)" "Delta_(r)H=411xx2" kJ/mole"),(H_(2)SO_(4)(l) rarr H_(2)(g)+S(s)+2O_(2)(g)" "Delta_(r)H=811" kJ/mole"),(2Na(s) +S(s)+2O_(2)(g)rarrNa_(2)SO_(4)(s)" "Delta_(r)H=-1382" kJ/mole"),(H_(2)(g)+Cl_(2)(g) rarr 2HCl(g)" "Delta_(r)H=-184" kJ/mole"),(bar(2NaCl(s)+H_(2)SO_(4)(l) rarr 2HCl(g)+Na_(2)SO_(4)(s)" "Delta_(r)H=67"kJ/mole")):}` `67=Delta_(r)U+(2xx8.3xx300)/(1000), Delta_(r)U=62.0" kJ/mole"` |
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