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Stoichiometry (Grades 11-12)

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If [math]W_2[/math] is the weight of solute in grams or Kgs and [math]W_1[/math] is the weight of solvent in grams or kgs, then what is the concentration of such a solution in parts per million (ppm)?
  1. Parts per million (ppm) = [math](W_2)/(W_1 + W_2) xx 10^6 [/math]
  2. Parts per million (ppm) = [math][(W_1 + W_2)/W_1] xx 10^-3[/math]
  3. Parts per million (ppm) = [math](W_1)/(W_1+W_2) + 10^2[/math]
  4. parts per million (ppm) = [math](W_2)/ (W_1 -W_2) xx 10^5[/math]
A sample of KCl weighing 10 g is dissolved in 200 mL of water. What is the weight percent of KCl in the solution (density of water = 1 g/mL)
  1. 4.76%
  2. 4.53%
  3. 4.95%
  4. 4.85%
Calculate the mass of sodium in kilograms present in 95 kilograms of a crude sample of sodium nitrate, whose percentage purity is 70%.
  1. 17.99 Kg
  2. 16.56 Kg
  3. 18.35 Kg
  4. 11.25 Kg
What do you term the ratio of the mass of the solution to the mass of an equal volume of water at a specified temperature?
  1. Specific gravity
  2. Density
  3. Molarity
  4. Molality
If W grams of solute, having an equivalent weight E, is dissolved in V liters of the solution, what is the expression of normality (N) in this case?
  1. [math]N = (W/E) (1/V)[/math]
  2. [math]N = (WE)/V[/math]
  3. [math]N = (WV)/E[/math]
  4. [math]N = (EV)/W[/math]
The concentration expressed in terms of mole fraction and molality is independent of temperature.
  1. True
  2. False
How many grams of NaOH are present in 1 mole of NaOH?
  1. 40 grams
  2. 50 grams
  3. 60 grams
  4. 70 grams
The mole is based on:
  1. speed of light
  2. Planck's constant
  3. pi
  4. Avogadro's number
The sum of the mole fractions of all the components in a given solution is equal to                 .
Determine the number of moles present in 0.0632 g of sulfur.

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