Lena772
  • Lena772
Determine the osmotic pressure (in atm) , at 80.2 o F, of an aqueous Iron (II) nitrate solution whose mole fraction of solute is 0.002696. Density solution = 1.11 g/mL
Chemistry
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SOLVED
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jamiebookeater
  • jamiebookeater
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Lena772
  • Lena772
PV= nRT So Posm = nRT/V R= 0.08206 L*atm/mol*k T= 80.2F = 299.928 K V = calculate somehow using density n = reverse mole fraction calculation to find total moles of solution
Lena772
  • Lena772
@taramgrant0543664 @photon336 Can you guys assist me in reversing the mole fraction equation to find total moles of solution and then using that calculation with the density to find volume?
taramgrant0543664
  • taramgrant0543664
V=m/d where v is volume, m is mass and d is density

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Lena772
  • Lena772
right, but i can't find the mass of the solution until i reverse the mole fraction and find moles of total solution
Lena772
  • Lena772
I think? Mole fraction = (moles solute) / (moles solute + moles solv ). We are given moles of solute, but I don't know where to go from here. :(
taramgrant0543664
  • taramgrant0543664
Yes that is the formula
taramgrant0543664
  • taramgrant0543664
You're not given moles of solvent?
Lena772
  • Lena772
@Abhisar @pooja195 @zepdrix @abb0t
Lena772
  • Lena772
Nope. :/
taramgrant0543664
  • taramgrant0543664
Hmmm... I don't know to tell you sorry I've only touched on osmotic pressure stuff none of my profs or teachers really talked much about it so I don't want to lead you on the wrong direction
Lena772
  • Lena772
Do you know anyone online that can help me? @taramgrant0543664
taramgrant0543664
  • taramgrant0543664
I think you got a majority of the ones that could hopefully help
Lena772
  • Lena772
@abb0t Do you think you can help me?
Lena772
  • Lena772
@NoelGreco Hi! Can you please help me?
mayankdevnani
  • mayankdevnani
@Lena772 can you find out molality ?
Lena772
  • Lena772
yes moles solute/kg solvent. But I don't know the moles of solute.
mayankdevnani
  • mayankdevnani
Here is a formula :- \[\large \bf Molality=\frac{X_{solute}\times 1000 }{(1-X_{solute}) \times M_{solvent}}\]
mayankdevnani
  • mayankdevnani
and then use this :- \[\large \bf Molarity=\frac{molality \times density \times 1000}{molality \times Molar~ mass~ of~ solute+1000}\]
mayankdevnani
  • mayankdevnani
hope you can find molarity
Lena772
  • Lena772
Molal = (0.002696 mol Solute * 1000) / ( 0.997304 * molality of solvent) , BUT idk the molality of the solvent
mayankdevnani
  • mayankdevnani
its molar mass of solvent
mayankdevnani
  • mayankdevnani
not molality of the solvent Remember molality is denoted by small m i.e `m`
Lena772
  • Lena772
Molal = (0.002696 mol Solute * 1000) / ( 0.997304 * 175.8948)
mayankdevnani
  • mayankdevnani
after you find out molarity ! Use this :- \[\large \bf Osmotic~Pressure(\pi)=Molarity \times RT \times vant~hoff~factor\]
Lena772
  • Lena772
0.015368778 molal ?
mayankdevnani
  • mayankdevnani
i don't know. Use calculator
mayankdevnani
  • mayankdevnani
i am here to give you HINTS as possible
Lena772
  • Lena772
molality = 0.94396197 0.94396197 * 0.08206 * 299.928 K * van hoult?
mayankdevnani
  • mayankdevnani
you don't know vant hoff factor ?
mayankdevnani
  • mayankdevnani
denoted by `i`
mayankdevnani
  • mayankdevnani
@Lena772 then first learn this term and then solve the rest of question
mayankdevnani
  • mayankdevnani
any problem ???
Lena772
  • Lena772
Would the factor be 4 because there is 3 pieces of iron nitrate and 1 piece of water molecule?
Lena772
  • Lena772
@mayankdevnani
mayankdevnani
  • mayankdevnani
nope ! try again
Lena772
  • Lena772
What's wrong about it?
mayankdevnani
  • mayankdevnani
see the oxidation state of iron in question. You took the oxidation state as +3
Lena772
  • Lena772
So van hoff is 3 ?
mayankdevnani
  • mayankdevnani
yup
Lena772
  • Lena772
I get 69.7 atm. That's sounds extreme. Can you just plug those in and see if you get the same value?
mayankdevnani
  • mayankdevnani
lol but i don't have much time to solve ! Sorry ! Better luck ,Next time
mayankdevnani
  • mayankdevnani
i have to go now ! Bye ! @Lena772 Its been a nice time with you ! :)
mayankdevnani
  • mayankdevnani
MEDAL for your HARDWORK and keen interest on solving this question !
mayankdevnani
  • mayankdevnani
REMEMBER :- Don't suppose that i am a professor, i am (18)-

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