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Twelfth Grade (Grade 12) Stoichiometry Questions

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Grade 12 Stoichiometry
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]
Grade 12 Stoichiometry
If W kg of solute is dissolved in V [math]m^3[/math] of solution, the molarity (M) can be expressed how?
  1. [math](W/V) = Molarity xx Mol. wt. of solute[/math]
  2. [math]Wxx V = Molarity xx Mol. wt. of solute[/math]
  3. [math](W/V) = (Molarity) /(Mol. wt. of solute)[/math]
  4. [math](W+V) = Molarity xx Mol. wt. of solute[/math]
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