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chemistry

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This question id from IB exam,please help!
1)Which compound has the highest lattice enthalpy?
A. CaO
B. CaS
C. LiF
D. LiI
Explain the reason ?

  • chemistry -

    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.

  • chemistry -

    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 ^_^

  • chemistry -

    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 ^_^

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