What is the molality of a 10.4 M CH3OH solution in H2O?

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Discussion Overview

The discussion revolves around calculating the molality of a 10.4 M CH3OH (methanol) solution in H2O, given its density of 0.858 g/mL. Participants explore the definitions of molarity and molality, as well as the necessary calculations to derive molality from the provided information.

Discussion Character

  • Homework-related
  • Mathematical reasoning

Main Points Raised

  • One participant requests assistance in calculating the molality of the solution based on its molarity and density.
  • Another participant suggests starting with the definitions of molarity and molality and hints at using percentage to molality conversion as a general approach.
  • A third participant expresses frustration, stating that the previous post was unhelpful.
  • A fourth participant emphasizes the importance of understanding the definitions and performing unit conversions, indicating that full solutions should not be provided without the original poster demonstrating effort.

Areas of Agreement / Disagreement

Participants do not reach a consensus on how to approach the problem, with some expressing dissatisfaction with the guidance provided and others reinforcing the need for foundational understanding before solving the problem.

Contextual Notes

Participants have not resolved the specific calculations needed to determine molality, and there may be assumptions regarding the definitions and conversions that are not explicitly stated.

mate1000
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Would anyone be able to help me with this question?
The density of a 10.4 M CH3OH (methanol) solution is 0.858 g/mL. What is the molality (m) of this solution? H2O is the solvent.
Anhy help is appreciated cheers.
 
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Start with definitions of both molarity and molality. See what and how you can calculate from the information given, what you need to find out molality.

See percentage to molality conversion example for hints on the general approach to this type of the question.
 


That is the most unhelpful post i have ever read
 


mate1000, Borek gave you advice on how to start. You must know and use the definitions of molarity and molality. The rest is simple unit conversions and simple concentration information. We posters on this board are expected not to plainly answer questions with full solution until the original questioner has tried to solve and shown some effort to do so.
 

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