How to write Stoichiometric ratio of a reaction?

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Discussion Overview

The discussion revolves around how to express the stoichiometric ratio of a chemical reaction involving H2N(CH2)3NH2 and HOOCCH2(C6H4)CH2COOH. Participants seek guidance on the semantics of writing the stoichiometric ratio rather than the specific reaction equation itself.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant requests guidance on expressing the stoichiometric ratio of the reaction without focusing on the specific equation.
  • Another participant suggests considering the functionality of the starting materials that will undergo the reaction.
  • A participant mentions that the stoichiometric ratio of KOH to H2SO4 is 2:1, using it as an example of how to express ratios in reactions.
  • One participant indicates that the reaction produces 2 molecules of H2O and a specific compound, questioning what ratio is needed.
  • Another participant points out that the products can undergo further reactions, leading to multiple possible products and suggesting that the average ratio is close to 1:1.
  • A participant expresses confusion about being marked down for suggesting a 1:1 ratio, seeking alternative options.
  • One participant notes that the reaction can produce different products depending on the ratios of the reactants, indicating that several stoichiometric ratios are possible.
  • A participant concludes that they do not see a better answer than 1:1 and expresses uncertainty about what is expected from the question author.
  • Finally, one participant thanks others for their input and mentions that the question is part of an edX.org course.

Areas of Agreement / Disagreement

Participants express differing views on the appropriate stoichiometric ratio, with some suggesting 1:1 while others indicate that multiple ratios may apply depending on the reaction conditions. The discussion remains unresolved regarding the expected answer.

Contextual Notes

Participants highlight the ambiguity in the question and the potential for various products and ratios based on the reactants used. There is uncertainty regarding the specific expectations of the question author.

wirefree
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Seasons' Greetings.

I have been asked to express the reaction of H2N(CH2)3NH2 with HOOCCH2(C6H4)CH2COOH in a stoichiometric ratio.

Would appreciate some guidance, not with the equation in particular, but the semantics of it.wirefree
 
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Can you see what functionality there is in your starting materials that will undergo the reaction?
 
Basically they ask to write reaction equation (that's where the sjb hint comes handy) and to write ratio of the coefficients. For example stoichiometric ratio of KOH to H2SO4 is 2:1 (assuming full neutralization is the reaction that is the most obvious one).
 
I'm half-way there:

For the two compounds, the reaction produces 2 molecules of H2O and NH(CH2)3NHCOCH2(C6H4)CH2CO

Just whose ratio is needed?

Thank you for your guidance,
wirefree
 
Ratio of reacting compounds.
 
Er, the products of that reaction can themselves undergo the same reaction so there are many products, a mixture of similar things, I don't remember whether this is a common polymer (or rather "copolymer"), obviously the average ratio of the two things in them is 1:1 or close. Seems more a question of pedantic terminology than substance.
 
Last edited:
I tried 1:1 but it got marked in the red.

What else can I try?
 
Sorry, this is more about a mind reading (what the question author had on mind) than about chemistry.

You have a diamine and a dicarboxylic acid. They can react producing a salt - and they will react 1:1, or 1:2, or 2:1, depending on the ratio of substances mixed. They can react producing amide - again, several ratios are possible, but in the case of long chain being produced (polyamide) stoichiometric ratio is 1:1.

I don't see any better answer than 1:1 and I have no idea what they expect.
 
Many thanks to all who attempted to address my concerns (& mind-reading the author).

For your reference, the question is part of edX.org's MITx: 3.091x Introduction to Solid State Chemistry course.wirefree
 

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