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2 H
2
+ 1 O
2
⇒ 2 H
2
O
Before Reaction
After Reaction
H
2
O
2
H
2
O
Reagents
H
2
= 4
O
2
= 1
Products
H
2
O = 2
Leftovers
H
2
= 2
H2 = 4
O2 = 1
H2O = 2 H2 = 2