Chemical Stoichiometry Review
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Questions and Answers

What is the formula weight of Mg(NO3)2?

  • 75.3 amu
  • 86.31 amu
  • 110.45 amu
  • 148.3 amu (correct)

    • How many moles of Hydrogen gas are there in 36g of Hydrogen?

  • 18 moles (correct)
  • 4.02 moles
  • 27 moles
  • 12 moles

    • How many Carbon atoms are there in 0.0015 gram of CO2?

  • 5 x 10^19 C atoms
  • 1.5 x 10^18 C atoms
  • 1.67 x 10^20 C atoms (correct)
  • 3 x 10^21 C atoms

    • How many moles of Iron are there in 1 gram of Iron? (atomic weight of Fe = 55.85 amu)

    <p>0.018 moles</p> Signup and view all the answers

    What is the empirical formula of a compound with 70% Oxygen and 30% sulfur by mass?

    <p>SO2</p> Signup and view all the answers

    In the reaction: 2 NaI + Pb(NO3)2 -> PbI2 + 2 NaNO3, how many moles of lead iodide are produced from 5 moles of sodium iodide?

    <p>10 moles</p> Signup and view all the answers

    What is stoichiometry based on?

    <p>Relative masses of moles</p> Signup and view all the answers

    What does an empirical formula provide?

    <p>Simplest whole number ratio of atoms in a compound</p> Signup and view all the answers

    What does a molecular formula specify?

    <p>Number of atoms in a molecule</p> Signup and view all the answers

    What is the purpose of stoichiometry in chemical reactions?

    <p>Interpreting the results of a chemical analysis</p> Signup and view all the answers

    What do structural formulas reveal about chemical compounds?

    <p>Structural differences not shown in the molecular formula</p> Signup and view all the answers

    Why are atomic weight scales established?

    <p>To establish a standard for atomic weights</p> Signup and view all the answers

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