The solubility of oxygen gas in water at 40 ∘c is 1.0 mmol/l of solution. what is this concentration in units of mole fraction? the solubility of oxygen gas in water at 40 is 1.0 of solution. what is this concentration in units of mole fraction? 1.80×10−5 1.80×10−2 1.00×10−2 5.55×10−2 1.00×10−6

The formula for mole fraction is:

   -(1)

The solubility of oxygen gas = 1.0 mmol/L  (given)

1.0 mmol/L means 1.0 mmol are present in 1 L.

Converting mmol to mol:

So, moles of oxygen = 0.001 mol

For moles of water:

1 L of water = 1000 mL of water

Since, the density of water is 1.0 g/mL.

So, the mass of water is 1000 g.

Molar mass of water = 18 g/mol.

Number of moles of water =

Substituting the values in formula (1):

Hence, the mole fraction is .