Question

question 4 · 1 point
balance the following equation:
h₂o₂ → h₂o + o₂
select the correct answer below:
o h₂o₂ → h₂o + o₂
o 2h₂o₂ → 2h₂o + o₂
o 2h₂o₂ → 2h₂o + 3o₂
o h₂o₂ → ³/₂h₂o + o₂

Explanation:

Step1: Count hydrogen atoms

On left - side of $\mathrm{H}_{2}\mathrm{O}_{2}\longrightarrow \mathrm{H}_{2}\mathrm{O}+\mathrm{O}_{2}$, there are 2 H atoms in $\mathrm{H}_{2}\mathrm{O}_{2}$, on right - side 2 H atoms in $\mathrm{H}_{2}\mathrm{O}$.

Step2: Count oxygen atoms

Left - side has 2 O atoms in $\mathrm{H}_{2}\mathrm{O}_{2}$, right - side has 1 O in $\mathrm{H}_{2}\mathrm{O}$ and 2 O in $\mathrm{O}_{2}$, total 3 O.

Step3: Balance oxygen

By putting a 2 in front of $\mathrm{H}_{2}\mathrm{O}_{2}$ and $\mathrm{H}_{2}\mathrm{O}$, we get $2\mathrm{H}_{2}\mathrm{O}_{2}\longrightarrow 2\mathrm{H}_{2}\mathrm{O}+\mathrm{O}_{2}$. Now, left - side has 4 H and 4 O, right - side has 4 H and 4 O.

Answer:

B. $2\mathrm{H}_{2}\mathrm{O}_{2}\longrightarrow 2\mathrm{H}_{2}\mathrm{O}+\mathrm{O}_{2}$