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Questions and Answers
Which term refers to the amount of solute present in a given amount of solution?
Which term refers to the amount of solute present in a given amount of solution?
- Mass percent (correct)
- Molality
- Normality
- Molarity
If a student mistakenly uses volume instead of mass while calculating the mass percent, which concentration term could provide a similar value to the incorrectly calculated mass percent?
If a student mistakenly uses volume instead of mass while calculating the mass percent, which concentration term could provide a similar value to the incorrectly calculated mass percent?
- Volume percent (correct)
- Molality
- Molarity
- Parts per million (ppm)
Which concentration term involves expressing concentration in terms of moles of solute per kilogram of solvent?
Which concentration term involves expressing concentration in terms of moles of solute per kilogram of solvent?
- Molality (correct)
- Normality
- Molarity
- Mole fraction
If a solution has a molarity of 2 M and a volume of 0.5 L, what is the number of moles of solute present in this solution?
If a solution has a molarity of 2 M and a volume of 0.5 L, what is the number of moles of solute present in this solution?
What is the molality of a solution that contains 20 g of NaCl dissolved in 200 g of water?
What is the molality of a solution that contains 20 g of NaCl dissolved in 200 g of water?
Calculate the mole fraction of ethylene glycol (C2H6O2) in a solution made by mixing 30 g of ethylene glycol with 70 g of water.
Calculate the mole fraction of ethylene glycol (C2H6O2) in a solution made by mixing 30 g of ethylene glycol with 70 g of water.
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Study Notes
Concentration Terms
- The term that refers to the amount of solute present in a given amount of solution is concentration.
Calculating Concentration
- If a student mistakenly uses volume instead of mass while calculating the mass percent, they may get a similar value to the incorrectly calculated mass percent using the concentration term of volume percentage.
Mole-Based Concentration
- The concentration term that involves expressing concentration in terms of moles of solute per kilogram of solvent is molality.
Molarity
- A solution with a molarity of 2 M and a volume of 0.5 L contains 1 mole of solute (moles = molarity x volume in liters).
Molality Calculation
- The molality of a solution that contains 20 g of NaCl dissolved in 200 g of water can be calculated by dividing the number of moles of NaCl by the mass of solvent in kg (molality = moles of solute / mass of solvent in kg).
Mole Fraction Calculation
- The mole fraction of ethylene glycol (C2H6O2) in a solution made by mixing 30 g of ethylene glycol with 70 g of water can be calculated by first finding the number of moles of each component, then dividing the number of moles of ethylene glycol by the total number of moles.
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