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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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riri87 riri87
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11 years ago
Consider an aqueous solution of isopropyl alcohol, C3H7OH. If the mole fraction of alcohol is 0.3466, what is the percent by mass of alcohol in the solution?



and


Consider an aqueous solution of isopropyl alcohol, C3H7OH. If the mole fraction of alcohol is 0.254, what is the molality of alcohol in the solution?

I just need an explanation, I am so confused.
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11 years ago
molefraction is the ratio of the number of moles of the particular component to the total number of moles of the solution. i.e.
     Molefraction of A     = No. of moles of A/ No. of moles of solution

Mass percentage = Mass of solute/mass of solution* 100




Molality of solution = no. of moles of solute /Mass of solvent in Kg

You just have to convert Moles to the mass by the relation:

Mole=mass/Molar mass
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ashtonmossashtonmoss
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11 years ago
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