(a) Draw the structure of P4S3 and describe an appropriate bonding scheme for this molecule. Compare the structures of P4S]0, P4S3 and P4, and comment on the formal oxidation states of the P atoms in these species. The elcctrical resistivity of Bi at 273 K is x 10”{' 11m. How do you expect this property to change as the temperature increases? On what grounds have you drawn your conclusion?
(b) Hydrated iron(III) nitrate was dissolved in hot IINO3 (100%), and the solution was placed in a desiccator with P2O5 until the sample had become a solid residue. The pure Fe(III) product (an ionic salt |NO2][X|) was collected by sublimation; crystals were extremely deliquescent. Suggest an identity for the product, clearly stating the charges on the ions. The Fe(ITT) centre has a coordination number of 8. Suggest how this is achieved.
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