Respuesta :
Answer:
8.67kJ/mol
Explanations
The formula for calculating the amount of heat absorbed by the water is given as:
[tex]\begin{gathered} q=mc\triangle t \\ q=50\times4.18\frac{J}{g^oC}\times(19-24) \\ q=50\times4.18\times(-5) \\ q=-1045Joules \\ q=-1.045kJ \end{gathered}[/tex]Determine the moles of KI
[tex]\begin{gathered} moles\text{ of KI}=\frac{mass\text{ of KI}}{molar\text{ mass of KI}} \\ moles\text{ of KI}=\frac{20g}{166g\text{/mol}} \\ moles\text{ of KI}=0.1205moles \end{gathered}[/tex]Since heat is lost, hence the enthalpy change of the solution will be negative that is:
[tex]\begin{gathered} \triangle H=-q \\ \triangle H=-(-1.045kJ) \\ \triangle H=1.045kJ \end{gathered}[/tex]Determine the enthalpy of solution in kJ•mol-1
[tex]\begin{gathered} \triangle H_{diss}=\frac{1.045kJ}{0.1205mole} \\ \triangle H_{diss}\approx8.67kJmol^{-1} \end{gathered}[/tex]Hence the enthalpy of solution in kJ•mol-1 for KI is 8.67kJ/mol
