How Is Carbon Calculated in Cementite and What Is Its Role in Pearlite?

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Discussion Overview

The discussion revolves around the calculation of carbon content in cementite (Fe3C), specifically focusing on determining atomic and weight percentages. Participants also explore the role of cementite in the structure of pearlite and its representation on the Fe-C phase diagram.

Discussion Character

  • Homework-related
  • Mathematical reasoning

Main Points Raised

  • One participant asks for assistance in calculating the atomic and weight percentages of carbon in cementite, indicating a lack of understanding of the concepts involved.
  • Another participant provides a method for calculating atomic percentages by expressing the ratio of iron to total atoms in the formula, suggesting a similar approach for carbon.
  • A further response reiterates the calculation method for atomic percentages and requests an example to clarify the process.
  • One participant outlines the composition of Fe3C, indicating the number of iron and carbon atoms, and prompts for the calculation of carbon's percentage of total atoms.

Areas of Agreement / Disagreement

Participants generally agree on the formula for cementite and the method for calculating atomic and weight percentages, but there is no consensus on the clarity of the explanation or the need for examples.

Contextual Notes

The discussion does not resolve the specific calculations or the properties of cementite in relation to pearlite, and assumptions about the participants' prior knowledge are not explicitly stated.

Who May Find This Useful

This discussion may be useful for students studying materials science, particularly those interested in phase diagrams and the properties of iron-carbon alloys.

p.mather
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Fe3C Cementite HELP PLEASE!

Hello... I was wondering if someone would be able to help with the follow question...

Cementite: consider cementite. Calculate the amount of carbon in Cementite (1) as atomic % (2) as weight % [atomic weights Fe 56, c 12]. Place cementite on the Fe-C phase diagram; explain the nature of its appearance on the diagram, and comment on the nature and properties of cementite. Cementite is a key part of pearlite- how does it contribute to the structure of pearlite?

I totally understand the question apart from the atomic % and the weight %, if someone could help i would be so grateful, thanks.
 
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The formula is Fe3C. That is three iron atoms per carbon. Express that ratio in terms of atoms Fe:total atoms in the formula to get Fe atomic %. Also find C:total atoms in the formula to get C atomic %. Convert that to weight to get Weight %.
 


chemisttree said:
The formula is Fe3C. That is three iron atoms per carbon. Express that ratio in terms of atoms Fe:total atoms in the formula to get Fe atomic %. Also find C:total atoms in the formula to get C atomic %. Convert that to weight to get Weight %.

could you give me a example as this really isn't my strong point, thanks
 


Fe3C contains ___ iron atoms, ___ carbon atoms, and ___ atoms in total.
Using those numbers, what percentage of the total atoms are carbon?
 

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