Which Method for Calculating Moles is More Effective?

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Discussion Overview

The discussion focuses on comparing two methods for calculating the number of moles in chemistry: one based on concentration and volume (n1=c1v1) and the other based on mass and molar mass (number of moles = mass/molar mass). Participants explore the applicability and effectiveness of each method in different contexts.

Discussion Character

  • Debate/contested

Main Points Raised

  • One participant questions whether both methods for calculating moles are valid and expresses a preference for the newer method based on concentration and volume.
  • Another participant argues that the two methods are applicable in different scenarios and emphasizes that the newer method is a rearrangement of the molar concentration definition.
  • A third participant points out a potential typo in the context of the discussion, suggesting a need for clarification.
  • A fourth participant claims that a formula used for calculating moles of HCl is incorrect, although the result is stated to be correct.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the effectiveness of the methods, with multiple competing views on their applicability and correctness in different situations.

Contextual Notes

There are indications of missing assumptions regarding the contexts in which each method is applied, as well as unresolved questions about specific calculations and potential typos in the discussion.

supernova1203
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Do both of these methods for calculating the number of moles work?

we've learned a new method recently which i prefer over the older method for current curriculum

n1=c1v1

n for number of moles, c for concentration 1 and v for volume 1
and the old method is

# of moles = mass/molar mass

does the first method work?
 
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You are asking to compare apples and oranges. How are you going to use the second method to calculate number of moles in 1 L of 0.3M solution, how are you going to use first method to calculate number of moles in 6g of carbon? Both approaches are correct, but they are used in completely different situations.

Besides, what you call a "new method" is just a rearranged molar concentration definition (which you probably should know by now):

C = \frac n V

solve for n.
 
Also there is another question, I am certain there's a typo here, if not see if this makes sense (attachment)
 

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Formula used to calculate number of moles of HCl is wrong, but otherwise result is correct.
 

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