Balancing Chemical equations

  • Chemistry
  • Thread starter Witcher
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  • #1
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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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Answers and Replies

  • #2
BvU
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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.
 
  • #3
Borek
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A is not a combustion reaction though.
 
  • #4
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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?
 
  • #5
mjc123
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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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