Mass Percent Video Lessons

Concept:

# Problem: A 2.800x10-2 M solution of NaCl in water is at 20.0° C. The sample was created by dissolving a sample of NaCl in water and then bringing the volume up to 1.000 L. It was determined that the volume of water needed to do this was 999.2 mL. The density of water at 20.0° C is 0.9982 g/mL.Calculate the concentration of the salt solution in percent by mass.

###### FREE Expert Solution

The mass percent formula shown below:

Since we are dealing with a solution, we can rewrite the equation as:

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###### Problem Details

A 2.800x10-2 M solution of NaCl in water is at 20.0° C. The sample was created by dissolving a sample of NaCl in water and then bringing the volume up to 1.000 L. It was determined that the volume of water needed to do this was 999.2 mL. The density of water at 20.0° C is 0.9982 g/mL.

Calculate the concentration of the salt solution in percent by mass.

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

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