Question

Osmotic pressure of insulin solution at 298 K is found to be 0.0072 atm. Hence height of water column due to this osmotic pressure is (density of Hg = 13.6 g cm${}^{-3}$)

• A. 0.76 mm
• B. 70.28 mm
• C. 74.42 mm
• D. 760 mm

Answer 1

Answer: (C)

Pressure = $hdg$
P = $hdg$ (for Hg)
1 atm = 76 mm of Hg
$\therefore 0.0072atm\equiv 0.0072\times$760 mm of Hg
P = 0.0072 $\times$ 760 $\times$ 13.6 $\times$ 9.8 (for Hg)
P = $h\times 1\times 9.8$ (for water)
(density of water = 1 g/cm${}^3$)
$\therefore 9.8\times h=0.0072\times 60\times 13.6\times 9.8$
$h=0.0072\times 760\times 13.6$ mm
= 74.42 mm