If the theoretical molecular mass of the compound referred to above is , suggest whether it is…

Since the experimental molecular mass ($161\cdot19\text{ g mol}^{-1}$) is greater than the theoretical molecular mass ($80\cdot5\text{ g mol}^{-1}$), the van 't Hoff factor $i = \frac{M_{\text{normal}}}{M_{\text{observed}}} = \frac{80\cdot5}{161\cdot19} \approx 0\cdot5 < 1$. Therefore, the compound is undergoing association (specifically dimerization).