Problem: An aqueous solution contains 32% HCl by mass.Calculate the molality of the solution.

🤓 Based on our data, we think this question is relevant for Professor Sheagley's class at PDX.

FREE Expert Solution

We will start by defining the mass percentage and molality.


<math xmlns="http://www.w3.org/1998/Math/MathML"><menclose mathcolor="#0000FF" notation="box"><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></menclose><mspace linebreak="newline"></mspace><menclose mathcolor="#0000FF" notation="box"><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></menclose></math>


We’ll solve this problem through these steps:

  • Find the mass of water
  • Find the molar mass of HCl
  • Finding the moles of HCl
  • Finding molality from mol HCl and mass of water


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Problem Details

An aqueous solution contains 32% HCl by mass.

Calculate the molality of the solution.

Frequently Asked Questions

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 Molality concept. You can view video lessons to learn Molality. Or if you need more Molality practice, you can also practice Molality practice problems.

What professor is this problem relevant for?

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