Angelina L.

asked • 03/17/22

Molarity/molality help #9

A solution is made from ethanol, C2H5OH, and water is 1.74 m in ethanol.

How many grams of C2H5OH are contained per 225 g of water?


__ g

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Ellen S. answered • 03/18/22

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molality is moles of solute / kg of solution so

1.74 = x/.225 kg x = .3915 mol C2H5OH ... then convert moles to grams of C2H5OH


.3915 x 46.08 g C2H5OH / 1 mol = 18.0 g C2H5OH

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Angelina L.

Thank you! Would you mind answering a few of my other posts?
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03/18/22

J.R. S.

tutor
Actually, molality is moles of solute / kg solvent not /kg solution. The answer of 18 g C2H5OH is correct, but the definition of molality is incorrect.
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03/18/22

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