= \({(\Delta H_{solution})}_{anhydrous\, salt} - {(\Delta H_{solution})}_{hydrated \,salt}\)
\(= - 29.4 = 21.0\)
\(= {(\Delta H_{solution})}_{hydrated\, salt}\)
\(= {(\Delta H_{solution})}_{hydrated\, salt}\) = \(+8.4 \,J \,mole ^{-1}\)
${H_2}{O_{(l)}} \to \,\,H_{(aq)}^ + + \,\,OH_{(aq)}^ - \,;\,\,\,\Delta H\,\, = \,\,57.32\,\,KJ\,;$
${H_2}_{(g)} + \,\,\frac{1}{2}\,\,{O_2}_{(g)} \to \,\,{H_2}{O_{(1)}}\,;\,\,\Delta H\,\, = \,\, - 286.20\,\,KJ$