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170.1(b) Calculate the number-average molar mass and the weight-average molar mass of a mixture of two polymers, one having M=62 kg mol- and the other

170.1(b) Calculate the number-average molar mass and the weight-average molar mass of a mixture of two polymers, one having M=62 kg mol- and the other M=78 kg mol-', with their amounts (numbers of moles) in the ratio 3:2

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