chemistry

Dissolve 1.5g of an unknown salt into 37g of water and find that the new vapor pressure at 75C is 277 torr. What is the Molar Mass of the unknown? How many grams of the unknown would have to be used in 100ml of water to make a 11.5% solution by mass of the unknown?

  1. 👍 0
  2. 👎 0
  3. 👁 113
asked by regina
  1. Psoln = XH2O*PoH2O
    Look up Po for H2O at 75, substitute 277 torr for Psoln and solve for XH2O.
    Then XH2O = (moles H2O)/(moles H2O + mols Unk).
    Solve for moles Unknown
    Then moles = grams/molar mass and solve for molar mass.
    Probably you can pick it up here and obtain the % by mass solution. Post your work if you get stuck.

    1. 👍 0
    2. 👎 0
    posted by DrBob222
  2. thoo

    1. 👍 0
    2. 👎 0
    posted by sajjan

Respond to this Question

First Name

Your Response

Similar Questions

  1. Science

    David has to dissolve salt crystals in the water. What would be the best thing to do to help the crystals dissolve quickly? A)heat the salt crystals B)crush the salt crystals C)cool the water in the tank D)use the largest salt

    asked by Sally on October 25, 2011
  2. Science

    If I mixed sugar and sand into the water,what would happen? The sugar would ___, and the sand would ___ dissolve;not dissolve Name 3 examples of a mixture sand and water powder and water marbles and paperclips When I mix salt and

    asked by running.from.myself on March 3, 2012
  3. Chemistry

    What kind of compound is table salt and how does it dissolve in water? Would salt dissolve in vegetable oil? Why or Why not?

    asked by Natalie on May 13, 2014
  4. science

    When 36.0g of sodium chloride is added to 100 g of H2O (water) at 25°C all the salt particles dissolve.Yet if you add one more g of salt and stir,no matter how vigorously or how long only 0.2g of the last portion dissolve in the

    asked by mike on September 5, 2013
  5. science

    Megan could dissolve only 36 grams of salt in 100ml of water. Describve what she could do if she wanted to dissolve more salt in 100ml of water? please i need the answer by tomorrow :(

    asked by Abii on September 4, 2011
  6. science

    Erin must perform a science experiment. She needs to dissolve 10 g of salt in 250 ml of water. She measures the water incorrectly and dissolves the 10 g of salt in 350 ml of water. Now she has no more salt. Explain what Erin can

    asked by astrid on April 29, 2008
  7. science

    this is a follow up question from my last one with the exact question If you dissolve 200 g of salt in 20 l of water, what is the density of that solution of salty water? Hint: In this particular example, assume that the total

    asked by dean on February 25, 2017
  8. Physics

    Given: cp,ice = 2090 J/kg◦C cp,water = 4186 J/kg ·◦C cp,steam = 2010 J/kg ◦C Lf = 3.33 × 105 J/kg Lv = 2.26 × 106 J/kg How much energy is required to change a 37 g ice cube from ice at −10◦C to steam at 116◦C?

    asked by Claudia on February 1, 2009
  9. Science 6TH Grade

    Salim added 1 g of salt to each of four beakers filled with water. He stirred the water at different speeds, and recorded how long it took for the salt to dissolved. Stirring - Time (sec) No stirring - 25 Slow stirring - 18 Medium

    asked by Mary PLEASEEEEE on October 26, 2011
  10. Science

    Salim added 1 g of salt to each of four beakers filled with water. He stirred the water at different speeds, and recorded how long it took for the salt to dissolved. Stirring Time (sec) No stirring 25 Slow stirring 18 Medium

    asked by Mary on October 25, 2011

More Similar Questions