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saya

Balancing is usually alot of guesses to get where you are.

H2O2+N2H4->HNO3+H2O

How I did this problem was by seeing how many moles of a certain element are there.

Original: H2O2+N2H4->HNO3+H2O

        H    2                4      1           2         Unequal! 6 versus 3

        O         2                        3          1     Unequal! 2 versus 4

        N                  2             1                   Unequal! 2 versus 1

7H2O2+N2H4->2HNO3+8H2O is your final answer (alot of guessing!)

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