Solutions Question 396

Question: At 20C and 1.00 atm partial pressure of hydrogen, 18 mL of hydrogen, measured at STP, dissolves in 1L of water. If water at 20C is exposed to a gaseous mixture having a total pressure of 1400 Torr (excluding the vapour pressure of water) and containing 68.5% H2 by volume, find the volume of H2, measured at STP, which will dissolve in 1L of water.

Options:

A) 18 mL

B) 12 mL

C) 23 mL

D) 121 mL

Show Answer

Answer:

Correct Answer: C

Solution:

p(H2)=(1400Torr)(0.685)

=959Torr959/760atm=1.26atm

According to Henry’s law

Amount of gas absorbed is directly proportional to pressure.

Hence V18mL=1.26atm1atm
V=23mL



NCERT Chapter Video Solution

Dual Pane