The density of totally crystalline polypropylene at room temperature is 0.946 g/cm3. Also, at room temperature the unit cell for this material is monoclinic with the following lattice parameters:
a = 0.666 nm | α = 90° |
b = 2.078 nm | β = 99.62° |
c = 0.650 nm | γ = 90° |
If the volume of a monoclinic unit cell, Vmono, is a function of these lattice parameters as
Vmono = abc sin β
determine the number of repeat units per unit cell.
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