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Calculations of Concentrations (Grades 11-12)

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Calculations of Concentrations

1. 
Which of the following correctly represents the equation for the molarity of a solution?
  1. [math]molarity={"moles of solute"}/{"moles of solvent"}[/math]
  2. [math]molarity={"moles of solvent"}/{"moles of solution"}[/math]
  3. Both (a) and (b)
  4. [math]molarity={"moles of solute"}/{"moles of solution"}[/math]
2. 
Which of the following correctly represents the equation for parts per million?
  1. [math]"parts per million" = {mass of solute}/{mass of solvent} xx 1000000[/math]
  2. [math]"parts per million" = {mass of solute}/{mass of solution} xx 1000000[/math]
  3. [math]"parts per million" = {mass of solvent}/{mass of solute} xx 1000000[/math]
  4. [math]"parts per million" = {mass of solvent}/{mass of solution} xx 1000000[/math]
3. 
Determine the molarity of 69 g of NaOH dissolved in 2 L of solution.
  1. 0.8625 M
  2. 1.725 M
  3. 3.45 M
  4. 6.90 M
4. 
What is the molarity of 6 moles of sodium chloride dissolved in 450 mL of solution?
  1. 75 mol/L
  2. 13.3 mol/L
  3. 0.013 mol/L
  4. 133.3 mol/L
5. 
What is the molality of 25 g of [math]Na_2O[/math] dissolved in 560 g of water?
  1. 0.045 molal
  2. 44.64 molal
  3. 446.4 molal
  4. 4.43 molal
6. 
A 560-gram sample of solution contains 44 g of lithium chloride. What is the concentration in parts per million?
  1. 78.571 ppm
  2. 78571 ppm
  3. 785.71 ppm
  4. 7857.1 ppm
7. 
A 1240-g sample of gas contains 400 g of helium. What is the percent composition of helium in this sample?
  1. 25%
  2. 32.3%
  3. 3.1%
  4. 31%
8. 
What is the molality of 4 moles of potassium nitrate dissolved in 240 g of water?
  1. 16.7 molal
  2. 60 molal
  3. 0.0167 molal
  4. 1.67 molal
9. 
32.5 g of hydrated oxalic acid is dissolved to get 1.5 [math]dm^3[/math] of solution. Calculate the normality of the solution.



10. 
A 597-g sample of a metal alloy contains 12.6 grams of copper. What is the percent composition of copper in this metal alloy?



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