18. Suppose a polydisperse polymer sample contains 5 moles with a molar mass of 1 kg/mol, 5 moles with a molar mass of 2 kg/mol, 5 moles with a molar mass of 3 kg/mol, and 5 moles with a molar mass of 4 kg/mol. Calculate the number average, weight average, and z-average molar masses.
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