Using the info below calculate the theoretical change for KCl, NaCl and LiCl Usi

Question

Using the info below calculate the theoretical change for KCl, NaCl and LiCl

Using the information below, calculate the theoretical DeltaH_soln for KCI, NaCI and LiCI. Show your work. KCI_(s) right arrow K^+ _(g) + CI^- _(g) 701 kJ/mol K^+ _(g) right arrow K^+ _(aq) -354.0 kJ/mol CI^- _(g) right arrow CI_(aq) -331.0kJ/mol NaCI_(s) right arrow Na^+ _(g) + CI^- _(g) 788 kJ/mol Na^+ _(g) right arrow Na^+ _(aq) -453.0 kJ/mol LiCI_(s) right arrow Li^+ _(g) + CI^- _(g) 834 kJ/mol Li^+ _(g) right arrow Li^+ _(aq) -540.4 kJ/mol Record these results in the theoretical DeltaH_soln row of Table 5 of POST-LAB for later use.

Explanation / Answer

dHsoln = dH(hydration) + dH(lattice)

For KCl,

dHsoln = -354 - 331 + 701 = 16 kJ/mol

For NaCl,

dHsoln = -453 - 331 + 788 = 4 kJ/mol

For LiCl,

dHsoln = -540.4 - 331 + 834 = -37 kJ/mol

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