What is the mole fraction of KIKI in a solution made by dissolving 3.4 g of KIKI in 5.8 g of water?

1 Answer
anor277
Jan 5, 2017

"Mole fraction"Mole fraction == "Moles of component"/"Moles of all species in solution"Moles of componentMoles of all species in solution

Explanation:

And thus, "Mole fraction, KI"Mole fraction, KI == "Moles of KI"/"Moles of KI + moles of water"Moles of KIMoles of KI + moles of water

=((3.4*g)/(166.00*g*mol^-1))/((3.4*g)/(166.00*g*mol^-1)+(5.8*g)/(18.01*g*mol^-1))=3.4⋅g166.00⋅g⋅mol−13.4⋅g166.00⋅g⋅mol−1+5.8⋅g18.01⋅g⋅mol−1 == 0.0600.060

Note that the mole fraction of "water"water here must be necessarily 1-0.060=0.941−0.060=0.94. Why "necessarily"necessarily?

Note that "mole fractions"mole fractions, as they are here, are dimensionless quantities.

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