How can oxidation numbers be used to balance chemical equations?

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Discussion Overview

The discussion focuses on the use of oxidation numbers to balance chemical equations, specifically addressing a problem from a textbook. Participants explore different methods for achieving balance among hydrogen, oxygen, and nitrogen atoms in the equations presented.

Discussion Character

  • Homework-related
  • Mathematical reasoning
  • Technical explanation

Main Points Raised

  • One participant expresses difficulty in balancing hydrogen and oxygen in their attempt to solve the problem.
  • Another participant requests clarification on the attached images, indicating they are not readable in their current orientation.
  • A participant points out that one of the reactions discussed is not a combustion reaction, suggesting a misclassification.
  • One suggestion involves using algebra to balance the equation by setting up a system of equations based on the number of nitrogen, hydrogen, and oxygen atoms.
  • Another participant proposes that using oxidation numbers may simplify the balancing process, highlighting the conservation of total oxidation numbers and providing specific oxidation state changes for oxygen and nitrogen.

Areas of Agreement / Disagreement

Participants have not reached a consensus on the best method to balance the equations, with multiple approaches being suggested and some disagreement on the classification of the reaction type.

Contextual Notes

There are unresolved issues regarding the clarity of the attached images and the specific details of the chemical reactions being discussed, which may affect participants' understanding and contributions.

Witcher
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Homework Statement
I have been on letter A problem for hours now and can’t seem to balance the equation.
Relevant Equations
It is a combustion reaction i think because both sides have oxygen and hydrogen
I attached my attempt and the question from the book, as you can see i kept failing because my hydrogens wouldn't balance and neither would my oxygens.
 

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I can't read the pictures: they are rotated 90 degrees to the right. Please put hem upright, or better: type them out.
 
A is not a combustion reaction though.
 
You can do example (a) algebraically. Write the balanced equation as $$aN_2H_4+bH_2O_2=cHNO_3+dH_2O$$Based on this, what is the balance on nitrogen atoms? What is the balance on H atoms? What is the balance on O atoms? Solve these 3 equations in 4 unknowns for b, c, and d in terms of a. What do you get?
 
This one may be simpler if you go by oxidation numbers, noting that total oxidation number is conserved.
Hint: oxygen goes from -1 to -2 (in both products); nitrogen goes from -2 to +5; H doesn't change.
 

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