What is the mole fraction of NaF in a solution consisting of 0.595 mole NaF and 11.1 mole of H2O.

0.0509

Explanation:

Mole fraction is essentially the number of moles of one of the substances divided by the total number of moles.

Here, we want to find the mole fraction of NaF. We have 0.595 moles of NaF, so we know that 0.595 is the numerator of the fraction.

The total number of moles will simply be the sum of the moles of NaF and H2O: 0.595 + 11.1 = 11.695 ≈ 11.7 (rounded off to 3 significant figures). So, 11.7 is the denominator.

Our mole fraction is 0.595 / 11.7 ≈ 0.0509. Note that there are no units because mole fraction has no units.