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If the enthalpy of formation and enthalpy of solution of HCl (g) are-92.3kj /mol and -75.14kJ/mol respectively then find the enthalpy of `Cl^(-)`(aq):A. `-17.16` kJ/molB. `-167.44` kJ/molC. 17.16 kJ/molD. None of these |
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Answer» Correct Answer - B `HCl(g)+aqrarrH^(+)(aq.)+Cl^(-)(aq.),` `Delta_(r )H=-75.14` `-75.14 = Delta_(f)H(H^(+),aq)+Delta_(f)H(Cl^(-),g)-Delta_(f)H(HCl, g)` `because " "Delta_(f)H(H^(+),aq)=0` `Delta_(f)H(Cl^(-),aq)=-75.14-92.3` `=-167.44 " kJ"//"mol"` |
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