Q31 / 160 · AP EAMCET 2023 (16 May Shift 2) · Chemistry

Poly dispersity index of a polymer is 1.25 If $\overline{\mathrm{M}}_{\mathrm{n}}$ is 800 , what is its $\overline{\mathrm{M}}_{\mathrm{w}}$ ?

  • A
    $800$
  • B
    $900$
  • C
    $950$
  • Correct answer
    D
    $1000$

Solution

$\mathrm{PDI}=\frac{\overline{\mathrm{M}}_{\mathrm{W}}}{\overline{\mathrm{M}}_{\mathrm{n}}}=1.25$ (given) $\overline{\mathrm{M}}_{\mathrm{n}}=800 \Rightarrow \overline{\mathrm{M}}_{\mathrm{W}}=800 \times 1.25=1000$

Hence, the correct answer is option: 'D'.

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