1. (a) A metal X has a cubic cell unit with lattice parameter of 0.288 nm. Its density and molar mass are 7.20 g cm-3 an

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1. (a) A metal X has a cubic cell unit with lattice parameter of
0.288 nm. Its density and molar mass are 7.20 g cm-3 and 52.0 g
mol-1 , respectively. i. Calculate the number of atoms per unit
cell, ii. Determine the crystal structure of X iii. What is the
atomic packing factor in X? iv. If x-rays with a wavelength of
0.1542 nm and n =1 are used, determine the interplanar spacing,
dhkl of (211). (12 marks) (b) What is the difference between
configuration and conformation in relation to polymer chain?
Describe the relative tendencies of the following polymers to
crystallize. Explain your answer. i. Low density polyethylene
versus high density polyethylene ii. Isotactic polypropylene versus
atactic polypropylene