Question

Human blood has an osmotic pressure of 7 .65 atm. at body temperature (37$^\circ$C). Hence molarity of an to have same osmotic pressure,will be

• A. 0.30 M
• B. 0.10 M
• C. 0.50 M
• D. 0.20 M

Answer 1

Answer: (A)

0.30 M

Answer 2

$\pi \, V = nRT$ $\pi = \frac{n}{V} RT$ $7.65 = \left( \frac{n}{V} \right) 0.0821 \times 310$ $\frac{n}{V} = \frac{7.65}{ 0.081 \times 310} = 0.30 \, mol \, L^{-1}$