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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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10 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?



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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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10 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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10 years ago
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