Solutions Question 259

Question: Freezing point of a biological fluid is −0.60∘C in aqueous solution Kf(H2O)=1.86∘mol− kg. Thus, its osmotic pressure at 310 K is (assume molarity = molality)

Options:

A) 0.0766 atm

B) 7.66 atm

C) 0.766 atm

D) 8.19 atm

Show Answer

Answer:

Correct Answer: D

Solution:

ΔTf=molality×Kf

0.60∘=molality×1.86∘mol−1kg . Given molality = molarity

∴Molality=0.601.86=0.322mol,kg−1 Or molarity =0.301,mol,L−1

Also, π=MRT=0.322×0.0821×310=8.19atm

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