ABC26PH0516 · Polymer Chemistry

Subject: Physical Chemistry · Chapter: Polymer Chemistry · Topic: Polymer – General · Exam: GATE 2005-2021 · Marks: 2 · Difficulty: Medium

\[ \begin{array}{l} \mathrm{M_1}=13.7 \qquad \mathrm{M_2}=15.5 \qquad \mathrm{M_3}=17.2 \qquad \mathrm{N_1}=\mathrm{N_2}=\mathrm{N_2}=\mathrm{N} \\[2mm] \overline{\mathrm{M}}_{\mathrm{n}}=\dfrac{\mathrm{N_1}\mathrm{M_1}+\mathrm{N_2}\mathrm{M_2}+\mathrm{N_3}\mathrm{M_3}}{\mathrm{N_1}+\mathrm{N_2}+\mathrm{N_3}}=\dfrac{\mathrm{M_1}+\mathrm{M_2}+\mathrm{M_3}}{3} \\[3mm] \overline{\mathrm{M}}_{\mathrm{w}}=\dfrac{\mathrm{N_1}\mathrm{M_1^{2}}+\mathrm{N_2}\mathrm{M_2^{2}}+\mathrm{N_3}\mathrm{M_3^{2}}}{\mathrm{N_1}\mathrm{M_1}+\mathrm{N_2}\mathrm{M_2}+\mathrm{N_3}\mathrm{M_3}}=\dfrac{\mathrm{M_1^{2}}+\mathrm{M_2^{2}}+\mathrm{M_3^{2}}}{(\mathrm{M_1}+\mathrm{M_2}+\mathrm{M_3})} \\[3mm] \text{P.D.I.}=\dfrac{\overline{\mathrm{M}}_{\mathrm{w}}}{\overline{\mathrm{M}}_{\mathrm{n}}} \end{array} \]
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