# Balancing Chemical equations

• Chemistry
Witcher
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.

#### Attachments

• 1C7E052C-DF5C-4981-9058-133078C66509.jpeg
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Homework Helper
I can't read the pictures: they are rotated 90 degrees to the right. Please put hem upright, or better: type them out.

Mentor
A is not a combustion reaction though.

Mentor
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?