Study the following thermodynamic data given
by E. H. P. Cordfunke, A. S. Booji and M. Y.
Furkalionk.
(i) ( mathrm{DyCl}_{3} ) (s) ( rightarrow mathrm{DyCl}_{3} ) (aq., in ( left.4.0 mathrm{M}-mathrm{HCl}right): Delta H^{0}= )
( -180.06 mathrm{kJmol}^{-1} )
(ii) ( mathrm{Dy}(mathrm{s})+3 mathrm{HCl}(mathrm{aq}, 4.0 mathrm{M}) rightarrow mathrm{DyCl}_{3} ) (aq, in ( 4.0 )
( mathrm{M}-mathrm{HCl})+3 / 2 mathrm{H}_{2}(mathrm{~g}): Delta H^{circ}=-699.43 mathrm{~kJ} mathrm{~mol}^{-1} )
(iii) ( 1 / 2 mathrm{H}_{2}(mathrm{~g})+1 / 2 mathrm{Cl}_{2}(mathrm{~g}) rightarrow mathrm{HCl}(mathrm{aq}, 4.0 mathrm{M}): Delta H^{circ}= )
( -158.31 mathrm{~kJ} mathrm{~mol}^{-1} )
What is ( Delta H_{mathrm{f}}^{0} ) of ( mathrm{DyCl}_{3} ) (s) from these data?
(a) ( -248.58 mathrm{~kJ} mathrm{~mol}^{-1} )
(b) ( -994.30 mathrm{~kJ} mathrm{~mol}^{-1} )
(c) ( -3977.2 mathrm{~kJ} mathrm{~mol}^{-1} )
(d) ( -1469.2 mathrm{~kJ} mathrm{~mol}^{-1} )
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