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chi_2 = n_2/n_t = (0.086 color(red)(cancel(color(black)("mol"))))/(1.46 color(red)(cancel(color(black)("mol")))) = "0.058"

#n_"NaCl" = 5.0 color(red)(cancel(color(black)("g NaCl"))) × "1 mol NaCl"/(58.44 color(red)(cancel(color(black)("g NaCl")))) = "0.086 mol NaCl"

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Warning! Long Answer. Mole percent is the percentage that the moles of a particular component are of the total moles that are in a mixture.

n_"H₂O" = 25.0 color(red)(cancel(color(black)("g H"_2"O"))) × ("1 mol H"_2"O")/(18.02 color(red)(cancel(color(black)("g H"_2"O")))) = "1.38 mol H"_2"O"

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Mole fraction #chi# (the Greek letter chi) is the number of moles of a given component of a mixture divided by the total number of moles in the mixture.

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What are the mole fraction and mole percent of sodium chloride and the mole fraction and mole percent of water in an aqueous solution containing 25.0 g water and 5.0 g sodium chloride?

#n_t = n_a + n_b + n_c + … # , where #n_t# = total number of moles #n_a# = moles of component a #n_b# = moles of component b #n_c# = moles of component c

The sum of the mole fractions for each component in a solution is equal to 1. For a solution containing two components, solute and solvent,

chi_1 = n_1/n_t = (1.38 color(red)(cancel(color(black)("mol"))))/(1.46 color(red)(cancel(color(black)("mol")))) = "0.942"#