The plot of osmotic pressure ($\pi$) vs concentration (mol L^–1) for a solution gives a straight line with slope 25.73 L bar mol^–1. The temperature at which the osmotic pressure measurement is done is: $\text{ (Use }\mathrm{R}=0.083\mathrm{Lbar}{\mathrm{mol}}^{-1}{\mathrm{K}}^{-1}\text{ ) }$