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Mass-average molecular mass of a polymer...

Mass-average molecular mass of a polymer is determined by:

A

Light scattering and ultracentrifuge method

B

Osmotic pressure

C

Depression of frezing point

D

Elevation in boiling point

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The correct Answer is:
A
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The number average molecular mass and mass average molecular mass of polymer is respectively 30,000 and 40,000. The poly dispersity index of the polymer is

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Knowledge Check

  • Number-average molecular mass of a polymer is determined by:

    A
    Light scattering and ultracentrifuge method
    B
    Osmotic pressure
    C
    Depression of frezing point
    D
    Elevation in boiling point

  • Statement 1: Mbar(n) (number -average molecular mass) of a polymer is determined by osmotic pressure method,while Mbar(w) (weight -average molecular mass)is determined by ultracentrifuge method. Statement 2:Osmotic pressure is a colligative property.

    A
    Statement `1` is true ,statement `2`is true,statement`2`is the correct explanation of statement`1`
    B
    Statement `1` is true ,statement `2`is true,statement`2`is not the correct explanation of statement`1`
    C
    Statement `1` is true ,statement `2`is false
    D
    Statement `1` is false,statement `2`is true

  • Generally molecular mass of a polymer is over

    A
    100
    B
    500
    C
    1000
    D
    10000

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    The number average molecular mass and mass average molecular mass of polymer is respectively 30,000 and 40,000. The poly dispersity index of the polymer is

    Which of the following statement(s) is /are correct? I. Molecular mass is expressed as an average. II Molecular mass of polymers can be determined by physical and chemical properties. Choose the correct option.

    Molecular mass of a volatile substance is determined by :

    Assertion: Molecular mass of a polymer is usually determined by osmotic pressure. Reason: This method measure more accurately the molecular mass of a polymer than by any other colligative property.

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