This question id from IB exam,please help!

Question

1)Which compound has the highest lattice enthalpy?
A. CaO
B. CaS
C. LiF
D. LiI
Explain the reason ?

Answer 1

Lattice energy is higher for higher charge on the ions; therefore, you would pick CaO or CaS as higher than LiF and LiI. Then the larger size of the ions decreases lattice energy; therefore, LiI is lower than LiF and CaS should be lower than CaO. I would go with CaO as having the highest lattice energy.

Answer 2

Thanks for helping me DrBob222.I am studying IB program and I have many questions and problems I do not understand about chemistry.I will post them later.I hope you can follow and help me.I am so grateful.Thank you so much ^_^

Answer 3

Thanks for helping me DrBob222.I am studying IB program and I have many questions and problems I do not understand about chemistry.I will post them later.I hope you can follow and help me.I am so grateful.Thank you so much ^_^