Answer to Question #77105 in Chemistry for merry

Question

1. Calculate the lattice enthalpy of KCl, in the rocksalt (B1) and Caesium chloride (B2) structures. Madelung constants: 1.748 (B1), 1.763 (B2). Electron charge 1.602 x 10^-19 C. r(KCl, B1) = 319 pm, r(KCl, B2) 332 pm. Which is expected to be the ground state structure at room conditions ?
2 。ZnSe exists in two polymorphs, Zink Blende (ZB) and Wurtzite (W). Assuming that r(ZnSe) does not sensibly change, which can be predicted to be the stable one at room conditions? Madelung constant ZB: 1.638, W: 1.641.

Answer 1

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