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Calculate the ratio of lattice energies ...

Calculate the ratio of lattice energies of `CaCl_(2(s))` and `NaCl_((s))`, if the inter-ionic distance in `CaCl_(2)` is twice that of `NaCl_((s))`.

Text Solution

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`r_(0) (NaCl) = r, r_(0) (CaCl_(2)) = 2r`.
`U_((NaCl)) prop (|Z^(o+)||Z^(ɵ)|)/(r_(0)) prop (1 xx 1)/(r ) prop (1)/(r )`

`U_((CaCl_(2))) prop (2 xx 1)/(2r) prop (1)/(r )`
`:. (U_((CaCl_(2))))/(U_((NaCl))) = 1:1`
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