We would like to measure the molecular weight of polyacrylonitrile $($PAN$)$ and poly$($vinyl chloride$)($PVC$)$ samples but our GPC equipment is calibrated using polystyrene $($PSt$)$ standards. The molecular weights are determined as $M_{n,\text{P}\text{A}\text{N}}=8\mathrm{.}000\frac{g}{m}ol$ and $M_{n,PVC}=40\mathrm{.}000\frac{g}{m}ol$ using our GPC$.$ What are the exact molecular weights of these PAN and PVC samples? The constants of PSt$,$ PAN and PVC $($ and $K)$ are below;

$\backslash$table$[[\backslash$table$[[K_{PSt}=14\mathrm{.}10{10}^{-5}$