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tigry1 [53]
3 years ago
5

The molality of a solution that is made by dissolving a certain mass of ethanol in 85.4 g of water is 0.950 m. How many moles of

ethanol were dissolved?
0.0811 mol
0.0899 mol
11.1 mol
81.1 mol
Chemistry
1 answer:
Marrrta [24]3 years ago
6 0
Data:

m (molality) = 0.950 mol/Kg
moles of solute = ? (mol) = ?
mass of solvent = 85.4 g → 0.0854 Kg

Formula:

m =  \frac{moles\:of\:solute}{mass\:of\:solvent}

Solving:

m = \frac{moles\:of\:solute}{mass\:of\:solvent}
0.950\:mol/\diagup\!\!\!\!\!\!K\diagup\!\!\!\!\!\!g = \frac{moles\:of\:solute}{0.0854\:\diagup\!\!\!\!\!\!K\diagup\!\!\!\!\!\!g}
moles\:of\:solute = 0.950*0.0854
\boxed{\boxed{moles\:of\:solute = 0.08113 \approx 0.0811\:mol}} \end{array}}\qquad\quad\checkmark
Answer:
0.0811 mol
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