Question

Determine the degree of association (polymerization) for the reaction in aqueous solution

$6\text{HCHO}\rightleftharpoons {\text{C}}_6{\text{H}}_{12}{\text{O}}_6$

If observed (mean) molar mass of $\text{HCHO}$ and ${\text{C}}_{\text{6}}{\text{H}}_{\text{12}}{\text{O}}_{\text{6}}$ is 150:

• A. 0.50
• B. 0.833
• C. 0.90
• D. 0.96

Answer 1

Answer: (D)

$\alpha =\frac{{\mathrm{M}}_{\mathrm{Th}}-{\mathrm{M}}_{\mathrm{obs}}}{(\mathrm{n}-1){\mathrm{M}}_{\mathrm{obs}}}$
$$\begin{gathered} =\frac{30-150}{[\frac{1}{6}-1]150} \\ =\frac{120}{\frac{5}{6}\times 150}=0.96 \end{gathered}$$