Question

2. (a) Rutile, the high-temperature form of titanium oxide, TiO2, adopts a tetragonal P structure with a 4.59 Å and c 2.96 Å Calculate the separation between the planes with the Miller indices (11). 110 (b) When radiation of wavelength 495 nm from a monochromatic flash lamp of power 0.500 kW is used to irradiate a low-pressure sample of iodine vapour, I2, the rate of production of iodine atoms is 3.24 x 1019 s 1. Assuming that all of the photons emitted by the lamp are absorbed by the iodine vapour (i) Calculate the quantum yield for dissociation of iodine molecules ) Discuss the possible reason why the quantum yield is less than unity. 191 16]

Answer 1

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2nd part of b is to be continued in the next page

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