Question

The osmotic pressure of $5$% (w/v) solution of cane sugar at ${150}^{0}C$ is:

[Molecular mass of sugar = $342$]

• A. $4$ atm
• B. $5.07$ atm
• C. $3.55$ atm
• D. $2.45$ atm

Answer 1

The correct option is B $5.07$ atm

$5$% $\left(w/v\right)$ solution means $5$ g cane sugar in $100$ mL solution.

$Molarity=\frac{wt.}{Mol.wt.}\times \frac{1000}{V\left(ml\right)}$ $=\frac{5}{342}\times \frac{1000}{100}$ $=0.146$

$\{T=150+273=423K\}$

$\pi =MRT$

$\pi =0.146\times 0.0821\times 423$

$\pi =5.07$ atm