i want the formula in case of solution containing a solute and a solvent???
2007-10-29 10:30:50 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
Molality (m or molal) denotes the number of moles of a given substance per kilogram of solvent (not solution). The mole fraction Χ, (also called molar fraction) denotes the number of moles of solute as a proportion of the total number of moles in a solution.
Let X be the mole fraction of the solute, and M (grams) the molar mass of the solvent. Also let m be the molality of the solution.
(1-X) is then the mole fraction of the solvent.
Consider X mole of solute in this solution, there are in this solution (1-X) moles of solvent, which is (1-X)M grams or (1-X)M/1000 kg of solvent. Hence the required molality is:
m = 1000X/{(1-X)M}
The required reverse function is:
X = Mm/(1000+mM)
2007-10-30 12:12:58 · answer #1 · answered by Hahaha 7 · 0⤊ 0⤋
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2016-05-17 01:27:02 · answer #2 · answered by ? 4 · 0⤊ 0⤋