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Q . 8 . Polystyrene is a polymer material with the following repeat unit structure: [ 4 ] Calcualte the weight average molecular weight for

Q.8. Polystyrene is a polymer material with the following repeat unit structure:
[4]
Calcualte the weight average molecular weight for polystyrene from the molecular weight data given below.
\table[[\table[[Molecular],[Weight Range],[(g/mol)]],\table[[x_(1)],[number],[fraction]],\table[[W _(i )],[weight fraction]]],[12000-24000,0.04,0.04],[24000-36000,0.11,0.14],[36000-48000,0.22,0.24],[48000-60000,0.27,0.23],[60000-72000,0.17,0.16],[72000-84000,0.11,0.12],[84000-96000,0.08,0.07]]
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