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Solutions: Mass Percent quiz

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Terms in this set (15)

  • What does mass or weight percent represent in a solution?
    It represents the percentage of a specific element or compound within a solution.
  • How do you calculate mass percent?
    Divide the mass of the solute by the total mass of the solution and multiply by 100.
  • In a 23% NaOH solution, how many grams of NaOH are present in 100 grams of solution?
    There are 23 grams of NaOH in every 100 grams of solution.
  • What is the formula for mass percent?
    Mass percent = (mass of solute / total mass of solution) × 100.
  • What two components make up the total mass of a solution?
    The total mass is made up of the solute and the solvent.
  • How do you find the mass of the solvent in a 23% NaOH solution?
    Subtract the mass of NaOH (23 g) from the total solution mass (100 g) to get 77 g of solvent.
  • If a solution is 23% NaOH by mass, what is the mass percent of the solvent?
    The solvent makes up 77% of the solution by mass.
  • Why do we assume the total solution mass is 100 grams when dealing with percentages?
    Because percentages are based on a total of 100, making calculations straightforward.
  • What does the numerator represent in the mass percent formula?
    It represents the mass of the solute.
  • What does the denominator represent in the mass percent formula?
    It represents the total mass of the solution (solute plus solvent).
  • How can mass percent be broken down for calculation?
    It can be broken down into the mass of solute over the sum of solute and solvent masses, times 100.
  • If you know the mass percent and total solution mass, how do you find the solute mass?
    Multiply the mass percent (as a decimal) by the total solution mass.
  • What is the importance of understanding solute and solvent breakdown in mass percent problems?
    It helps in accurately solving and setting up mass percent calculations.
  • If a solution contains 30 grams of solute in 120 grams of solution, what is the mass percent?
    The mass percent is (30/120) × 100 = 25%.
  • What should you do if you get stuck on a mass percent problem?
    Move on to the next example or video for guidance on how to approach the problem.