Download Chemistry 1311 Problem Set 6 1. CsCl has a simple cubic lattice

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Transcript
Chemistry 1311
Problem Set 6
1. CsCl has a simple cubic lattice. Calculate the density of CsCl given that the unit cell
dimension is 4.12 Å.
2. Using the data given below and the standard heat of formation (ΔHfo) of -1214.6
kJ/mol to calculate the lattice energy of CaF2.
Heat of atomization (sublimation) of Ca = 178 kJ/mol–1
Bond dissociation energy of F2 = 155 kJ/mol–1
Electron affinity of fluorine = 322 kJ/mol–1
First ionization energy of Ca = 590 kJ/mol–1
Second ionization energy of Ca = 1145 kJ/mol–1
3, Which of the following salts would be expected to have the highest lattice energy?
Why? FeO, Fe2O3, FeS, Fe2S3
4. Which of the salts, MgTe or CaTe, would be most likely to adopt a structure in which
the coordination number of the cation is 4? Give the reason(s) for your choice.
5. The unit cell of a rhenium oxide is shown below. What is the empirical formula of the
compound?
6. Order the following ions according to their expected enthalpies of hydration (least
exothermic to most exothermic): Sc3+, Fe3+, Ca2+. What factors determine the order.
7. Which of the following salts will be only sparingly soluble in water? Co(NO3)2,
CePO4, NH4Cl, Na3PO4, TiO2