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In a polymer sample, 30% molecules have ...

In a polymer sample, 30% molecules have molecular mass 20000, 40% have molecular mass 30000 and the rest 30% have 60000. Calculate their number average and mass average molecular masses.

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AI Generated Solution

To calculate the number average molecular mass (Mn) and the mass average molecular mass (Mw) of the polymer sample, we can follow these steps: ### Step 1: Identify the molecular masses and their percentages - Molecular mass 1 (M1) = 20,000 g/mol, Percentage (P1) = 30% - Molecular mass 2 (M2) = 30,000 g/mol, Percentage (P2) = 40% - Molecular mass 3 (M3) = 60,000 g/mol, Percentage (P3) = 30% ### Step 2: Calculate the number average molecular mass (Mn) ...
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Knowledge Check

  • In a polymer sample, 30% of molecules have a molecualr mass of 20,000, 40% have 30,000 and the rest 60,000. What is the weight average molecular mass of the polymer?

    A
    403000
    B
    306000
    C
    43333
    D
    50400

  • In a polymer sample 30% of molecules have a molecular mass 20,000 , 40 % have 30,000 and the rest 60,000 . What is the weight average molecular mass of the polymer

    A
    40300
    B
    30600
    C
    43333
    D
    50400

  • A sample of polymer contains 30% molecules with molecular mass 20,000, 40% with molecular mass 30,000 and 30% with 60,000. What is the number average molecular mass of the polymer?

    A
    36000
    B
    48000
    C
    50000
    D
    25000