Calculating Solution Composition: Isopropanol in Water

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Discussion Overview

The discussion revolves around a homework problem involving the calculation of solution composition, specifically focusing on isopropanol dissolved in water. Participants are addressing the mole fraction, mass percent, and molality of isopropanol in the solution.

Discussion Character

  • Homework-related
  • Technical explanation

Main Points Raised

  • One participant presents the homework statement and asks for help with the calculations, expressing uncertainty about the steps to take.
  • Another participant comments on the frequency of posts, suggesting that repeated requests for answers may not be effective.
  • A participant prompts the original poster to clarify their understanding of the definitions and equations related to mole fraction, mass percent, and molality.
  • One participant provides the equations for mole fraction, mass percent, and molality, questioning whether the original poster should simply plug in the values or if additional steps are required.
  • Several participants emphasize the importance of showing work in order to receive more targeted assistance, suggesting that understanding the calculations is crucial.

Areas of Agreement / Disagreement

There is no clear consensus among participants. Some emphasize the need for the original poster to demonstrate their understanding and show their work, while others express frustration with the posting frequency. The discussion remains unresolved regarding the best approach to assist the original poster.

Contextual Notes

Participants have not agreed on the level of assistance that should be provided, and there are varying expectations regarding the original poster's effort and understanding of the problem.

jdhutto
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Homework Statement



A solution is made by disolving 0.40 mol isopropanol (C3H7OH) in 0.70 mol water.
(a) What is the mole fraction of isopropanol?

(b) What is the mass percent of isopropanol?
%
(c) What is the molality of isopropanol?
m



Homework Equations





The Attempt at a Solution




Not sure what steps to take here?
 
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Whoa man why are you posting so many times, if they don't answer they don't answer. I've been waiting for an answer, if someone knows then they'll hopefully help you if not? posting 20 times won't help.
 
Do you know the definitions of each of those quantities? Can you show the equations for them? Check your book. Tell us what is giving you trouble. You need to show more effort, we can't do all the work for you!
 
mole fraction= amount (mol) of solute / amount (mol) of solute + amount (mol) of solven

mass percent= mass of solute/ mass of solute + mass of solvent x 100

molality = amount mol of solute/ mass kg of solvent


i know the equations do i just plug the quantities in or is there more to it than that
 
jdhutto said:
i know the equations do i just plug the quantities in or is there more to it than that
show more work in your post(s) and we'll be glad to help :)

it won't help you very much if we just direct you straight to the answerrr
 
i know the equations do i just plug the quantities in or is there more to it than that

Just try to do the calculations. Look at what the equation is asking for. Was it given to you in the question? Do you have to do some calculations to get those quantities in the equation? The best way to get help is to show your work. That way we can see what you're not understanding.
 

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