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P15A.6 Fully crystalline polyethene has its chains aligned in an orthorhombic unit cell of dimensions 740 pm x 493 pm x 253pm. There are two

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P15A.6 Fully crystalline polyethene has its chains aligned in an orthorhombic unit cell of dimensions 740 pm x 493 pm x 253pm. There are two repeating CH,CH, units in each unit cell. Calculate the theoretical mass density of fully crystalline polyethene. The actual mass density ranges from 0.92 to 0.95 gcm 3

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