# Problem: An aqueous solution is in equilibrium with a gaseous mixture containing an equal number of moles of oxygen, nitrogen, and helium. Rank the relative concentrations of each gas in the aqueous solution from highest to lowest.a) [O2] &gt; [N2] &gt; [He]b) [He] &gt; [N2] &gt; [O2]c) [N2] &gt; [He] &gt; [O2]d) [N2] &gt; [O2] &gt; [He]

###### FREE Expert Solution

We’re being asked to rank the relative concentrations of each gas in the aqueous solution from highest to lowest.

Recall that the solubility of a gas is given by Henry’s law:

$\overline{){{\mathbf{S}}}_{{\mathbf{gas}}}{\mathbf{=}}{{\mathbf{k}}}_{{\mathbf{H}}}{\mathbf{·}}{{\mathbf{P}}}_{{\mathbf{gas}}}}$

where:
Sgas = solubility of the gas (in mol/L or M)
kH = Henry’s law constant for the gas
Pgas = partial pressure of the gas

The Henry's law constant of each gas can be found in books or the internet:

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###### Problem Details

An aqueous solution is in equilibrium with a gaseous mixture containing an equal number of moles of oxygen, nitrogen, and helium. Rank the relative concentrations of each gas in the aqueous solution from highest to lowest.

a) [O2] > [N2] > [He]

b) [He] > [N2] > [O2]

c) [N2] > [He] > [O2]

d) [N2] > [O2] > [He]