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.
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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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Chemistry: Matter and Change
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