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Stoichiometry Questions - All Grades

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Grade 12 Stoichiometry
If W2 is the weight of solute in grams or Kgs and W1 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) = W2W1+W2×106
  2. Parts per million (ppm) = [W1+W2W1]×10-3
  3. Parts per million (ppm) = W1W1+W2+102
  4. parts per million (ppm) = W2W1-W2×105
Grade 12 Stoichiometry
If W kg of solute is dissolved in V m3 of solution, the molarity (M) can be expressed how?
  1. (WV)=Molarity×Mol.wt.ofsolute
  2. W×V=Molarity×Mol.wt.ofsolute
  3. (WV)=MolarityMol.wt.ofsolute
  4. (W+V)=Molarity×Mol.wt.ofsolute
Grade 11 Stoichiometry
All of the following are valid combinations EXCEPT
  1. Liters/moles.
  2. particles/moles.
  3. grams/moles.
  4. kg/ºC.
Grade 11 Stoichiometry
How do you determine gram-formula mass mathematically?
  1. Subtract the elements' subscripts
  2. Subtract each element's atomic mass from each other
  3. Add together the products of the elements' atomic masses and their respective subscripts
  4. Multiply by the number of elements
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