12. The Henry’s law constant for the solubility of

N₂  gas in water at 298 K is 1.0 x 10 ⁵  atm. The mole fraction of N₂   in air is 0.8. The number of moles of N₂  form air dissolved in 10 moles of water at 298 K and 5 atm pressure is

a. 4.0 x 10^-4

b. 4.0 x 10^-5

c. 5.0 x 10^-4

d. 4.0 x 10^-6

Ans. a

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