Recall equations for a) molality, b) mole fraction, c) percent by mass and d) ppm
solute → NaCl
solvent → H2O
A 2.950×10−2M 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 molality of the salt solution. Express your answer to four significant figures and include the appropriate units.
Calculate the mole fraction of salt in this solution. Express the mole fraction to four significant figures.
Calculate the concentration of the salt solution in percent by mass. Express your answer to four significant figures and include the appropriate units.
Calculate the concentration of the salt solution in parts per million. Express your answer as an integer to four significant figures and include the appropriate units.
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.