Use the following data to calculate the enthalpy of hydration for calcium chloride and calcium iodide.?

Question

CaCl2 lattice energy is -2247 kj/mol delta H of solution is -46 kj/molCaI2 lattice energy is -2059 kj/mol delta H of solution is -104 kj/molThe enthalpy of energy should just be in kJ.which ion Cl ‾ or I ‾, is more strongly attracted to water? Please explain how you figured it out because I’m lost. Thank you

Bernhard White · Accepted Answer

basically add up the two numbershydration is 2247 + 46as hydration is able in this case to overcome the lattice energy AND then release some energy to spare.—Cl- is more attrracted as the total number above is greater

Bernhard White · Answer

34. (a) Use the following data to calculate the enthalpy of hydration for calcium chloride and calcium iodide. Lattice Energy ∆Hsoln CaCl2(s) –2247 kJ/mol –46 kJ/mol CaI2(s) –2059 kJ/mol –104 kJ/mol Using the equations for lattice enthalpy and the enthalpy of solution for each ionic solid, we can calculate the enthalpy of hydration of each compound. CaCl2(s) → Ca2+(g) + 2Cl–(g) ∆H = –LE = –(–2247) kJ/mol = 2247 kJ/mol Ca2+(g) + 2Cl–(g) → Ca2+(aq) + 2Cl–(aq) ∆Hhyd = ? kJ/mol ––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––CaCl2(s) → Ca2+(aq) + 2Cl–(aq) ∆Hsoln = –46 kJ/mol ∆Hhyd (CaCl2) = –2293 kJ/mol CaI2(s) → Ca2+(g)I–(g) ∆H = –LE = –(–2059) kJ/mol = 2059 kJ/mol Ca2+(g) + 2I–(g) → Ca2+(aq) + 2I–(aq) ∆Hhyd = ? kJ/mol ––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––CaI2(s) → Ca2+(aq) + 2I–(aq) ∆Hsoln = –104 kJ/mol ∆Hhyd (CaI2) = –2163 kJ/mol (b) Based on your answers to part a, which ion, Cl– or I–, is more strongly attracted to water? The enthalpy of hydration of calcium chloride is more exothermic than that of calcium iodide. Since these compounds contain a common cation Ca2+, this difference arises from the halide ion. Since more exothermic energy is associated with the hydration of the chloride ion, it is more strongly attracted to water.

Jonathon Rolfson

Use the following data to calculate the enthalpy of hydration for calcium chloride and calcium iodide.?

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