Regents Review Stoichiometry Quiz
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Questions and Answers

What is the empirical formula for the compound C6H12O6?

  • C6H12O6
  • C2H4O2
  • C3H6O3
  • CH2O (correct)

    • The empirical formula of a compound is CH2. The molecular formula of this compound could be

  • C2H4
  • C2H2 (correct)
  • C2H6
  • CH4

    • The formula H2O2 is an example of

  • an empirical formula
  • an organic formula
  • a molecular formula (correct)
  • an ionic formula

    • What is the gram-formula mass of Ca3(PO4)2?

    <p>263 g/mol</p> Signup and view all the answers

    Which substance has the greatest molecular mass?

    <p>I2</p> Signup and view all the answers

    How many moles of water are contained in 0.250 mole of CuSO4·5H2O?

    <p>1.25 moles</p> Signup and view all the answers

    What is the total mass in grams of 0.75 mole of SO2?

    <p>13.4 g</p> Signup and view all the answers

    What is the mass in grams of 1.00 mole of O2 gas?

    <p>266 g</p> Signup and view all the answers

    What is the total number of atoms of oxygen in the formula Al(ClO3)3?

    <p>48</p> Signup and view all the answers

    What is the gram formula mass of Na2CO3·10H2O?

    <p>233.3 g</p> Signup and view all the answers

    If the empirical formula for an organic compound is CH2O, then the molecular mass of the compound could be?

    <p>180</p> Signup and view all the answers

    A compound has an empirical formula of CH2 and a molecular mass of 56. What is its molecular formula?

    <p>(CH2)8</p> Signup and view all the answers

    Which of the following gases has the greatest density at STP?

    <p>CO2</p> Signup and view all the answers

    A sample of an unknown gas at STP has a density of 1.25 grams per liter. What is the gram molecular mass of this gas?

    <p>80.0 g</p> Signup and view all the answers

    Study Notes

    Empirical and Molecular Formulas

    • The empirical formula for C6H12O6 is CH2O.
    • If the empirical formula is CH2, the molecular formula could be C2H4, C3H6, C4H8, etc.

    Molecular Mass and Formula Mass

    • The formula H2O2 is an example of a molecular formula.
    • The gram-formula mass of Ca3(PO4)2 is the sum of the atomic masses of calcium, phosphorus, and oxygen.
    • The substance with the greatest molecular mass is the one with the largest sum of atomic masses of its constituent atoms.

    Moles and Grams

    • 0.250 mole of CuSO4·5H2O contains 1.25 moles of water.
    • The total mass in grams of 0.75 mole of SO2 is calculated by multiplying the number of moles by the molar mass.
    • The mass in grams of 1.00 mole of O2 gas is 32.0 g.

    Atoms and Molecules

    • The total number of atoms of oxygen in the formula Al(ClO3)3 is 13.
    • The gram formula mass of Na2CO3·10H2O is the sum of the atomic masses of sodium, carbon, oxygen, and hydrogen.

    Molecular Mass and Empirical Formula

    • If the empirical formula is CH2O, the molecular mass could be 30, 60, 90, etc.
    • A compound with an empirical formula of CH2 and a molecular mass of 56 has a molecular formula of C4H8.

    Gas Density

    • The density of a gas at STP is directly proportional to its molecular mass.
    • The gas with the greatest density at STP is the one with the largest molecular mass.
    • A sample of an unknown gas at STP with a density of 1.25 grams per liter has a gram molecular mass of 44.8 g.

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    Description

    Test your understanding of stoichiometry with this quiz that covers empirical formulas, molecular formulas, and compound compositions.

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