12th Grade General Chemistry: Solutions and Concentration
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Questions and Answers

What is the molar mass of HCl?

  • 40.46 g/mol
  • 37.47 g/mol
  • 35.46 g/mol
  • 36.47 g/mol (correct)

    • What is the molality of a solution containing 15 g of HCl in 400 g of water?

  • 1.03 mol/kg (correct)
  • 1.01 mol/kg
  • 1.26 mol/kg
  • 1.50 mol/kg

    • How many grams of Mg(OH)2 are needed to prepare 0.4 m solution, using 550 g of water, H2O?

  • 12.5 g
  • 25.5 g
  • 15.5 g (correct)
  • 20.5 g

    • What is the molarity of a solution that contains 10.0 moles of solute in 2000.0 mL solution?

    <p>4.0 M</p> Signup and view all the answers

    What is the mass of sucrose (C12H22O11) needed to prepare 250.0 mL of a 0.250M solution?

    <p>12.5 g</p> Signup and view all the answers

    What is the units of molality?

    <p>moles per kilogram</p> Signup and view all the answers

    What is the concentration unit that represents the mass of solute in grams present in 100g of solution?

    <p>Percent by mass</p> Signup and view all the answers

    What is the term used to describe a solution that contains a large proportion of solute relative to the solvent?

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

    A 0.5M solution of NaCl is prepared. What is the number of moles of NaCl present in 1L of this solution?

    <p>0.5</p> Signup and view all the answers

    A solution contains 20g of NaCl in 100g of water. What is the percent by mass of NaCl in this solution?

    <p>20</p> Signup and view all the answers

    What is the unit of concentration that represents the number of moles of solute per kilogram of solvent?

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

    A 2M solution of NaCl is prepared. What is the mass of NaCl present in 1L of this solution?

    <p>117g</p> Signup and view all the answers

    What is the formula to calculate the percentage of a solute in a solution by mass-volume?

    <p>mass of solute / volume of solution × 100</p> Signup and view all the answers

    A 20% (m/v) solution of sodium chloride is prepared. What is the mass of sodium chloride in 250 mL of this solution?

    <p>50 g</p> Signup and view all the answers

    What is the difference between molarity and molality?

    <p>Molarity is the number of moles of solute per liter of solution, while molality is the number of moles of solute per kilogram of solvent.</p> Signup and view all the answers

    What is the concentration of a solution in which 2.5 g of sodium nitrate is dissolved in 0.05 kg of water?

    <p>5% (m/m)</p> Signup and view all the answers

    A 30% (v/v) solution of ethylene glycol is prepared. What is the volume of ethylene glycol in 200 mL of this solution?

    <p>60 mL</p> Signup and view all the answers

    What is the molar mass of glucose (C6H12O6)?

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

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