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Tenth Grade (Grade 10) Stoichiometry Questions

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Grade 10 Stoichiometry
The mole is based on
  1. speed of light.
  2. Planck's constant.
  3. pi.
  4. Avogadro's number.
Grade 10 Stoichiometry
Why is the mole important?
  1. It gives us a convenient way to express large numbers.
  2. It is useful when converting between grams and atoms or molecules.
  3. It can be applied to any type of object: molecules, atoms, ions, etc.
  4. All of the above.
Grade 10 Stoichiometry
How many moles are in 75.0 grams of nitrogen gas, N2?
  1. 3.00 moles
  2. 0.333 moles
  3. 2.68 moles
  4. 4.52 moles
Grade 10 Stoichiometry
In the reaction A+B→C+D, if element B is in excess, then
  1. element A is the limiting reactant.
  2. element B is the limiting reactant.
  3. element C is the limiting reactant.
  4. element D is the limiting reactant.
Grade 10 Stoichiometry
How many atoms are in 3 moles of H2O?
  1. 18 atoms
  2. 6.02×1023 atoms
  3. 1.8×1024 atoms
  4. 1800 atoms
Grade 10 Stoichiometry
How many moles are in 1.2×103 grams of ammonia, NH3?
  1. 126.0 moles
  2. 70.6 moles
  3. 95.3 moles
  4. 1200 moles
Grade 10 Stoichiometry
How many grams are in 0.02 moles of beryllium iodide, BeI2?
  1. 0.02 grams
  2. 5.2 grams
  3. 2.63 grams
  4. 263 grams
Grade 10 Stoichiometry
Given 3.3 moles of potassium sulfide, K2S, how many grams of potassium sulfide is available?
  1. 364.0 grams
  2. 131.97 grams
  3. 33.40 grams
  4. 110.24 grams
Grade 10 Stoichiometry
The compound formula for dinitrogen trisulfide is which of the following choices?
  1. N2S3
  2. N2H4
  3. N2O3
  4. N2O5
Grade 10 Stoichiometry
What is the volume of 2.00 moles of nitrogen gas (N2) at STP?
  1. 11.2 L
  2. 28.0 L
  3. 44.8 L
  4. 56.0 L
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