Analytical Chemistry: Chemical Calculations
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Questions and Answers

What is the ratio in which O combines with H to form water (H2O)?

  • 1:2 (correct)
  • 2:1
  • 1:1
  • 3:1

    • How many molecules of H2O are formed when 4 atoms of H combine with 2 atoms of O?

  • 2 molecules
  • 3 molecules (correct)
  • 5 molecules
  • 4 molecules

    • What is the term for the simple numerical ratios in which atoms combine to form molecules?

  • Atomic theory
  • Stoichiometry (correct)
  • Chemical bonding
  • Molecular structure

    • In stoichiometry, what does the term 'mole' represent?

    <p>Amount of substance</p> Signup and view all the answers

    Which concept helps in understanding the quantities of reactants and products in a chemical reaction?

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

    What is the definition of mole?

    <p>The sum of atomic weights of a molecule</p> Signup and view all the answers

    What is the ratio of carbon moles to chlorine moles needed for the preparation of C2Cl6 (hexachloroethane)?

    <p>1:3</p> Signup and view all the answers

    How many moles of carbon are required to combine with 4.87 moles of Cl to form C2Cl6 (hexachloroethane)?

    <p>1.29 moles</p> Signup and view all the answers

    What is the molar mass of Si (Silicon) if 30.5g of Si corresponds to 2.65 moles?

    <p>28.1g/mol</p> Signup and view all the answers

    What is the formula weight of Na2CO3 (sodium carbonate) if the molecular weight is 106.0g?

    <p>132g</p> Signup and view all the answers

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