An aqueous solution of isopropyl alcohol, c3h8o, rubbing alcohol, has a mole fraction of alcohol equal to 0.367. What is the percent by mass of the alcohol in the solution? What is the molality of the alcohol?
Answers
convert the moles of alcohol into grams
0.259 moles of alcohol @ 60.1 g mol−1 = 15.566 grams of alcohol
find total mass
15.566 grams of alcohol + 13.345 grams of water = 28.911 total grams
the percent by mass of the alcohol in the solution
15.566 grams of alcohol / 28.911 total grams = 53.8 % alcohol by mass
2 answers · Chemistry
Best Answer
2. .What is the molality of the alcohol? _________ m C3H8O
if rubbing alcohol, has a mole fraction of alcohol equal to 0.259
then it has a mole fractionof 0.741 of water
find mass, using molar mass:
0.741 moles of water @ 18.01 g/mol = 13.345 grams of water
find molality
0.259 moles of alcohol / 0.0013345 kg of water = 19.4 molal
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