Question

If O₂ gas is bubbled through water at 303 K, the number of millimoles of O₂ gas that dissolve in 1 litre of water is ______. (Nearest integer)

(Given: Henry's Law constant for O₂ at 303 K is 46.82 k bar and partial pressure of O₂ = 0.920 bar)

(Assume solubility of O₂ in water is too small, nearly negligible)

Options

• 5

• 1

• 6

• 0

Answer 1

If O₂ gas is bubbled through water at 303 K, the number of millimoles of O₂ gas that dissolve in 1 litre of water is 1.

Explanation:

p = `"K"_"H" xx x`

0.920 bar = 46.82 × 10³ bar × `("mol of O"_2)/("mol of H"_2"O")`

0.920 = 46.82 × 10³ bar × `("mol of O"_2)/(1000//18)`

0.920 = 46.82 × `n_("O"_2) xx 18`

`=> n_("O"_2) = 1.09 xx 10^3`

m mol of O₂ = 1