Understanding Molarity Formula
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Questions and Answers

What is the correct molarity of a solution containing 0.225 moles of sodium chloride in 2.80 liters?

  • 0.320 M
  • 0.0406 M
  • 0.100 M
  • 0.0804 M (correct)

    • In Problem 2, what is the molar mass of sodium chloride?

  • 35.45 g/mole
  • 22.99 g/mole
  • 45.21 g/mole
  • 58.44 g/mole (correct)

    • What is the correct molarity of a solution with 158 grams of sodium chloride in a volume of 2.50 liters?

  • 3.00 M
  • 0.63 M
  • 1.08 M (correct)
  • 0.125 M

    • How many moles of sodium chloride are in a solution containing 298 grams in a volume of 175 milliliters?

    <p>5.10 moles</p> Signup and view all the answers

    What is the correct molality of a solution with 298 grams of sodium chloride in a solvent weighing 1.20 kilograms?

    <p>4.25 m</p> Signup and view all the answers

    What is the molarity formula based on?

    <p>Moles of solute and liters of solution</p> Signup and view all the answers

    How is the molar mass of a substance calculated?

    <p>Summing the atomic masses of each element in the molecular formula</p> Signup and view all the answers

    In the molecular formula N2 O5, what is the molar mass of this substance?

    <p>108.02 g/mol</p> Signup and view all the answers

    How can the moles of a substance be determined if given the grams of the substance?

    <p>By multiplying the mass in grams by the molar mass</p> Signup and view all the answers

    What does successful problem solving in chemistry require?

    <p>Taking a structured approach</p> Signup and view all the answers

    What is the molality of a solution containing 298 grams of sodium chloride in a solvent weighing 375 grams?

    <p>13.6 m</p> Signup and view all the answers

    When preparing solutions in a laboratory, which concentration unit is typically used?

    <p>Molarity (M)</p> Signup and view all the answers

    What is the drawback of using molarity as a concentration unit?

    <p>Volume changes affect calculated solute concentration</p> Signup and view all the answers

    Which technique would most likely require the use of molality over molarity?

    <p>Determining the freezing point depression of a solution</p> Signup and view all the answers

    How does a change in temperature affect molality compared to molarity?

    <p>Molality remains constant with temperature change, molarity fluctuates</p> Signup and view all the answers

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