Chemical transformation (Decomposition)

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SUMMARY

The discussion centers on the rules governing the representation of chemical equations, specifically regarding coefficients and subscripts in the decomposition of substances. The example provided, 2H2O → 2H2 + O2, illustrates the correct representation, emphasizing that oxygen exists as a diatomic molecule (O2) rather than as individual atoms (O). The distinction is crucial for adhering to chemical laws, such as Lavoisier's law, which states that matter cannot be created or destroyed in a chemical reaction.

PREREQUISITES
  • Understanding of chemical equations and stoichiometry
  • Knowledge of diatomic molecules, specifically O2
  • Familiarity with Lavoisier's law of conservation of mass
  • Basic principles of chemical decomposition reactions
NEXT STEPS
  • Study the principles of stoichiometry in chemical reactions
  • Learn about diatomic molecules and their significance in chemical equations
  • Explore Lavoisier's law and its applications in chemical reactions
  • Investigate common types of chemical reactions, focusing on decomposition
USEFUL FOR

Chemistry students, educators, and anyone interested in understanding the fundamentals of chemical reactions and the proper representation of chemical equations.

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Hi, I was wondering when you need to write the decomposition of a substance, how do you know if the number is going to be a coefficient or subscript ?

Example:

2H2O ===>2H2 + 02 would be the answer

But why not

2H2O ==> 2H2 + 2O

Knowing that we have 2 moles of O in the beginning...

So ?

Thank you!
 
Chemistry news on Phys.org
Although 2H2O ==> 2H2 + 2O does not violate Lavoisier's law, oxigen is a diatomic molecule and therefore the substance 'O' that appears in that equation doesn't truly exist.
 

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