Stoichiometry Problem: Mole Conversion
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Questions and Answers

What is the ratio of moles of O2 to moles of H2O in the reaction?

  • 5:6 (correct)
  • 4:5
  • 5:4
  • 6:5

    • How many moles of O2 are required to react with 10 moles of NH3?

  • 12 moles
  • 12.5 moles (correct)
  • 15 moles
  • 10 moles

    • What is the limiting reactant in the reaction between 10 moles of NH3 and 10 moles of O2?

  • Both are limiting reactants
  • Neither is a limiting reactant
  • O2 (correct)
  • NH3

    • What is the role of the limiting reactant in a chemical reaction?

    <p>It determines the amount of product formed</p> Signup and view all the answers

    What is the mole ratio of NH3 to O2 in the reaction?

    <p>4:5</p> Signup and view all the answers

    What is the definition of an excess reactant?

    <p>The reactant that is present in excess</p> Signup and view all the answers

    How many moles of H2O are formed from 5 moles of O2?

    <p>6 moles</p> Signup and view all the answers

    What is the mole ratio of H2O to O2 in the reaction?

    <p>6:5</p> Signup and view all the answers

    What is the decimal equivalent of the prefix giga?

    <p>1000000000</p> Signup and view all the answers

    What is the prefix that represents 10^6?

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

    How many significant figures does the number 5432 have?

    <p>4</p> Signup and view all the answers

    Who is the author of the preface in the UPCAT review book?

    <p>Leopold Laset</p> Signup and view all the answers

    What is the decimal equivalent of the prefix deca?

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

    How many significant figures does the number 4000 have?

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

    What is the trademark of KB Tutorial and Consulting Corp?

    <p>All of the above</p> Signup and view all the answers

    What is the prefix that represents 10^3?

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

    What can be found on the official website of Review Masters?

    <p>Tips and news about UPCAT</p> Signup and view all the answers

    What is the copyright year of the UPCAT review book?

    <p>2015</p> Signup and view all the answers

    What is the decimal equivalent of the prefix micro?

    <p>0.000001</p> Signup and view all the answers

    What is the result of having a dream and working hard for it?

    <p>Transforming the dream into reality</p> Signup and view all the answers

    What is the purpose of the significant figures guideline?

    <p>To estimate the uncertainty of a measurement</p> Signup and view all the answers

    Who can pass the UPCAT?

    <p>Dreamers like you</p> Signup and view all the answers

    What is required to pass the UPCAT?

    <p>Believing that you can pass the UPCAT</p> Signup and view all the answers

    What is the purpose of the preface in the UPCAT review book?

    <p>To encourage students to believe in their ability to pass the UPCAT</p> Signup and view all the answers

    What is the formula to convert Fahrenheit to Celsius?

    <p>5/9 (0F - 32)</p> Signup and view all the answers

    What is the result of multiplying 7.4 x 10^(-3) and 1.3 x 10^(-4)?

    <p>9.62 x 10^(-7)</p> Signup and view all the answers

    What is the result of dividing 9.62 x 10^(-7) by 8.006 x 10^(-2)?

    <p>1.20 x 10^(-5)</p> Signup and view all the answers

    What is the formula to convert Celsius to Kelvin?

    <p>K = 0C + 273</p> Signup and view all the answers

    What is the definition of accuracy in measurements?

    <p>The closeness of measurements to a true value.</p> Signup and view all the answers

    What is the result of converting 45°F to Celsius?

    <p>7.22°C</p> Signup and view all the answers

    What is the result of converting 7°C to Kelvin?

    <p>280 K</p> Signup and view all the answers

    What is the definition of a measurement?

    <p>A number defined by an appropriate unit.</p> Signup and view all the answers

    What is the maximum number of electrons that can be held in a d-type orbital?

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

    Which of the following sublevels is filled first according to the Aufbau Principle?

    <p>1s</p> Signup and view all the answers

    What is the period number of an element with a valence configuration of 3s23p5?

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

    What is the maximum number of electrons that can be held in a p-type orbital?

    <p>6</p> Signup and view all the answers

    What is the order of filling orbitals according to the Aufbau Principle?

    <p>1s 2p 2s 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s 5f 6d 7p</p> Signup and view all the answers

    What is the maximum number of electrons that can be held in an s-type orbital?

    <p>2</p> Signup and view all the answers

    What is the valence configuration of an element in the 5th period?

    <p>5s25p5</p> Signup and view all the answers

    Which of the following is NOT a correct statement about the Aufbau Principle?

    <p>The Aufbau Principle states that the 2p sublevel is filled before the 3s sublevel.</p> Signup and view all the answers

    Study Notes

    Stoichiometry

    • Limiting reactant or reagent: the substance that limits the amount of products that can be formed in a reaction; it is always used up in the reaction.
    • Excess reactant or reagent: the reagent that is more than enough to react with a limiting reactant or reagent.
    • In a chemical reaction, for every 4 moles of NH3, 5 moles of O2 will react.
    • The conversion from moles of O2 to moles of H2O can be calculated as follows: mole H2O / mole O2 = 18 mol H2O / 5 mol O2.

    Chemistry Concepts

    • Significant figures or digits: those digits in a measurement that are known with certainty and the last digit uncertain or estimated.
    • General guidelines for determining significant figures:
      • Non-zero digits are always significant.
      • Zeros may or may not be considered significant.

    Temperature Conversions

    • Temperature conversion formulas:
      • °C → °F: 9/5 (°C) + 32
      • °F → °C: 5/9 (°F – 32)
      • °C → K: °C + 273

    Atomic Structure

    • Aufbau Principle: states that electrons occupy the lowest available energy levels in an atom.
    • The order of sublevels in an atom, in increasing energy, is: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p.
    • A particular sublevel or orbital can only hold a maximum number of electrons.

    Chemistry Tips

    • Measurements are expressed as a number defined by an appropriate unit.
    • Accuracy refers to the closeness of measurements to a true value.

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    Description

    Solve a stoichiometry problem involving mole conversion of H2O and O2. Practice your chemistry skills and find the correct answer.

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