Answer: 2H₂O₂ → 2H₂O + O₂
Step-by-step explanation:
1. Count all the elements on either sides of the equation.
Left side:
H = 2
O = 2
Right side:
H = 2
O = 3
2. The number of H is the same on both sides. We focus on the O since it is different.
Let's add a coefficient 2 to H2O on the right side so that O becomes an even number. Multiply to find the number of elements.
Left side:
H = 2
O = 2
Right side:
H = 4
O = 4
3. Now we need to address the number of H. Add a 2 to the left side to multiply the H by 2.
Left side:
H = 4
O = 4
Right side:
H = 4
O = 4
Now they are the same.
The resulting equation is: 2H₂O₂ → 2H₂O + O₂