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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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Nursing2010 Nursing2010
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11 years ago
What is the mass percent of an aqueous sodium hydroxide solution in which the mole fraction
of NaOH is 0.231? The density of the solution is 1.4339 g/mL.
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#1
11 years ago
You have 0.231 mol NaOH dissolved in 1.00-0.231 = 0.769 mol H2O

Molar mass NaOH = 40g/mol
0.231mol = 0.231*40 = 9.24g NaOH
molar mass H2O = 18g/mol
0.769 mol = 0.769*18 = 13.84g H2O

You have 9.24+13.84 = 23.08 g solution in total

Mass % NaOH = 9.24/23.08*100 = 40.0% m/m
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leon1977leon1977
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#2
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11 years ago
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rei
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#3
10 years ago
an aqueous solution contains 700 grams water and 45 grams sodium hydroxide.what is the percent by mass of sodium hydroxide?
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