Interpretation:
Mole fraction of NaOHin aqueoussolution has to be calculated.
Concept introduction:
Mole fraction: It’s another way of expressing concentration of a solution. Mole fraction defined as the number of moles of one component divided by total the number of moles in the mixture. The number of moles of one species in a mixture is always less than the total number of , oles thus, mole fraction has value between 0 to 1. Mole fraction is denoted as
The mole fraction for the solvent
Mole fraction
Where, ? A and ?B represent the mole fractions of each substance. nA and nBrepresent the number of moles of each substance.
Answer to Problem 29PP
The mole fraction of NaOH is 0.118.
Explanation:
Write the expression of mole fraction:
Mole fraction
Aqueous solution contains 22.8 % NaOH by mass means 100.0 g aqueous solution of NaOH contains 22.8 g NaOH. So, mass of NaOH = 22.8 gm
Mass of water = Mass of solution − Mass of NaOH = (100 − 22.8) gm = 77.2 gm
Number of moles of NaOH (n NaOH)
Calculate the moles of water:
Write the expression for Mole fraction of NaOH
The mole fraction of NaOH is 0.118.
Explanation of Solution
Write the expression of mole fraction:
Mole fraction
Aqueous solution contains 22.8 % NaOH by mass means 100.0 g aqueous solution of NaOH contains 22.8 g NaOH. So, mass of NaOH = 22.8 gm
Mass of water = Mass of solution − Mass of NaOH = (100 − 22.8) gm = 77.2 gm
Number of moles of NaOH (n NaOH)
Calculate the moles of water:
Write the expression for Mole fraction of NaOH
The mole fraction of NaOH is 0.118.
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