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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: stacker on December 14, 2009, 09:21:41 PM

Title: What is the lattice energy of LiI? Given the information below.
Post by: stacker on December 14, 2009, 09:21:41 PM

Heat of formation for LiI = -270 kJ/mol

Heat of sublimation for Li = 159.40 kJ/mol

Ionization energy for Li = 520 kJ/mol

Bond dissociation energy for I₂ = 149 kJ/mol

Electron affinity for I = - 295 kJ/mol

Heat of sublimation for I₂ = 48.30 kJ/mol

Title: Re: What is the lattice energy of LiI? Given the information below.
Post by: gregdwulet on December 24, 2009, 08:22:51 PM

Well what have you tried?

Try to balance the synthesis reaction of Li and I, then think through what would have to happen to solid lithium and iodine gas in order for them to combine and form LiI. Once you have that broken into steps, you can use the information provided to find the lattice energy (Hint: Don't just add all of the values together).