$\begin{array}{1 1}13980.4gmol^{-1}\\12980.4gmol^{-1}\\11980.4gmol^{-1}\\10980.4gmol^{-1}\end{array} $

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$W=100mg=0.100g$

$V=10.0mL=0.01L$

$\pi=13.33$mm Hg=$\large\frac{13.3}{760}$ atm

$T=25^{\large\circ}C=25+273=298K$

R=0.0821L atm $mol^{-1}K^{-1}$

Molar mass $M=\large\frac{WRT}{\pi V}$

$\Rightarrow \large\frac{0.1\times 0.0821\times 298}{\Large\frac{13.3}{760}\times \normalsize 0.01}$

$\Rightarrow \large\frac{0.1\times 0.0821\times 298\times 760}{13.3\times 0.01}$

$\Rightarrow\large\frac{ 1859\times 4008}{0.133}$

$\Rightarrow 13980.4g mol^{-1}$

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