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$0.2 \mathrm{M}$ aqueous solution of glucose has osmotic pressure $4.9 \mathrm{~atm}$ at $300 \mathrm{~K}$. What is the concentration of glucose if it has osmotic pressure $1.5 \mathrm{~atm}$ at same temperature?
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0.06 M
$\begin{aligned} & \pi=\mathrm{M} \times \mathrm{R} \times \mathrm{T} \\ \therefore \quad & \mathrm{M}=\frac{\pi}{\mathrm{RT}}=\frac{1.5}{0.082 \times 300}=0.06 \mathrm{M}\end{aligned}$
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