Explanation
π = CST or π/C = ST.
This means that you have 5.2 moles of methyl alcohol by 1 kg of water . 1 kg of water contains (molar weight of water is 18g) 1000/18 = 55.6 mole of water molecule.
Then,
mole fraction = (moles of methanol) / (sum of moles methanol + water) x = 5.2/(55.6 + 5.2) = 0.0856 = 8.56%
In chemistry , a solution is a homogeneous mixture composed of two or more substances. Here Benzene in water is not an example of solution. Since benzene cannot dissolve in water because of its chemical structure which is non polar in nature. The water molecule is polar. Like dissolves like, since benzene and water are of different polarities they will form distinct layers and not dissolve.
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