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
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

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