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The number average molar mass and mass a...

The number average molar mass and mass average molar mass of a polymer are respectively 30,000 and 40,000. The polydispersity index of the polymer is

A

`lt1`

B

`gt1`

C

0

D

`-1`

Text Solution

Verified by Experts

The correct Answer is:
B
olydispersity index (P.D.I.)
`="Mass average molar mass"/"Number average molar mass"=M_w/M_n = (40,000)/(30,000)=1.3 gt 1`
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Knowledge Check

  • 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

    A
    ` lt 1 `
    B
    `gt 1`
    C
    1
    D
    0

  • The mass average molecular mass & number average molecular mass of a polymer are 40,000 and 30,000 respectively. The polydispersity index of polymer will be

    A
    `lt1`
    B
    `gt1`
    C
    1
    D
    0

  • 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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