Problem: Calculate the molality, molarity, and mole fraction of FeCl3 in a 28.8 mass % aqueous solution (d = 1.280 g/mL).

FREE Expert Solution

We will start by defining the units of solution concentration.


<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>M</mi><mi>o</mi><mi>l</mi><mi>a</mi><mi>r</mi><mi>i</mi><mi>t</mi><mi>y</mi><mo>&#xA0;</mo><mo>=</mo><mfrac><mrow><mo>&#xA0;</mo><mi>m</mi><mi>o</mi><mi>l</mi><mo>&#xA0;</mo><mi>s</mi><mi>o</mi><mi>l</mi><mi>u</mi><mi>t</mi><mi>e</mi></mrow><mrow><mi>L</mi><mo>&#xA0;</mo><mi>s</mi><mi>o</mi><mi>l</mi><mi>u</mi><mi>t</mi><mi>i</mi><mi>o</mi><mi>n</mi></mrow></mfrac><mspace linebreak="newline"></mspace><mi>M</mi><mi>o</mi><mi>l</mi><mi>a</mi><mi>l</mi><mi>i</mi><mi>t</mi><mi>y</mi><mo>&#xA0;</mo><mo>=</mo><mfrac><mrow><mo>&#xA0;</mo><mi>m</mi><mi>o</mi><mi>l</mi><mo>&#xA0;</mo><mi>s</mi><mi>o</mi><mi>l</mi><mi>u</mi><mi>t</mi><mi>e</mi></mrow><mrow><mi>k</mi><mi>g</mi><mo>&#xA0;</mo><mi>s</mi><mi>o</mi><mi>l</mi><mi>v</mi><mi>e</mi><mi>n</mi><mi>t</mi></mrow></mfrac><mspace linebreak="newline"></mspace><mi>m</mi><mi>o</mi><mi>l</mi><mo>&#xA0;</mo><mi>f</mi><mi>r</mi><mi>a</mi><mi>c</mi><mi>t</mi><mi>i</mi><mi>o</mi><mi>n</mi><mo>&#xA0;</mo><mfenced><msub><mi>X</mi><mi>A</mi></msub></mfenced><mo>&#xA0;</mo><mo>=</mo><mfrac><mrow><mo>&#xA0;</mo><mi>m</mi><mi>o</mi><mi>l</mi><mo>&#xA0;</mo><mi>o</mi><mi>f</mi><mo>&#xA0;</mo><mi>A</mi></mrow><mrow><mi>t</mi><mi>o</mi><mi>t</mi><mi>a</mi><mi>l</mi><mo>&#xA0;</mo><mi>m</mi><mi>o</mi><mi>l</mi></mrow></mfrac><mspace linebreak="newline"></mspace><mi>m</mi><mi>a</mi><mi>s</mi><mi>s</mi><mo>&#xA0;</mo><mo>%</mo><mfenced><mrow><mi>s</mi><mi>o</mi><mi>l</mi><mi>u</mi><mi>t</mi><mi>e</mi><mo>&#xA0;</mo><mi>o</mi><mi>r</mi><mo>&#xA0;</mo><mi>s</mi><mi>o</mi><mi>l</mi><mi>v</mi><mi>e</mi><mi>n</mi><mi>t</mi></mrow></mfenced><mo>&#xA0;</mo><mo>=</mo><mo>&#xA0;</mo><mfenced><mfrac><mrow><mo>&#xA0;</mo><mi>m</mi><mi>a</mi><mi>s</mi><mi>s</mi><mo>&#xA0;</mo><mi>o</mi><mi>f</mi><mo>&#xA0;</mo><mi>s</mi><mi>o</mi><mi>l</mi><mi>u</mi><mi>t</mi><mi>e</mi><mo>&#xA0;</mo><mi>o</mi><mi>r</mi><mo>&#xA0;</mo><mi>s</mi><mi>o</mi><mi>l</mi><mi>v</mi><mi>e</mi><mi>n</mi><mi>t</mi></mrow><mrow><mi>m</mi><mi>a</mi><mi>s</mi><mi>s</mi><mo>&#xA0;</mo><mi>o</mi><mi>f</mi><mo>&#xA0;</mo><mi>s</mi><mi>o</mi><mi>l</mi><mi>u</mi><mi>t</mi><mi>i</mi><mi>o</mi><mi>n</mi></mrow></mfrac></mfenced><mo>&#xD7;</mo><mn>100</mn></math>


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Problem Details

Calculate the molality, molarity, and mole fraction of FeCl3 in a 28.8 mass % aqueous solution (d = 1.280 g/mL).

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Mole Fraction concept. You can view video lessons to learn Mole Fraction. Or if you need more Mole Fraction practice, you can also practice Mole Fraction practice problems.

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Based on our data, we think this problem is relevant for Professor Larsen's class at UH.

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Our data indicates that this problem or a close variation was asked in Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition. You can also practice Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition practice problems.