Question

hbr(aq) + o₂(g) → h₂o(l) + br₂(l)
express your answer as a chemical equation. identify all of the phases in your answ
hbr(aq) + o2(g)h2o(l) + br2(l)
a chemical reaction does not occur for this question.

Explanation:

Step1: Balance Br atoms

Add coefficient 2 to HBr: $2\text{HBr}(aq) + \text{O}_2(g)
ightarrow \text{H}_2\text{O}(l) + \text{Br}_2(l)$

Step2: Balance H atoms

Current H: 2 on left, 2 on right (balanced)

Step3: Balance O atoms

Add coefficient $\frac{1}{2}$ to $\text{O}_2$: $2\text{HBr}(aq) + \frac{1}{2}\text{O}_2(g)
ightarrow \text{H}_2\text{O}(l) + \text{Br}_2(l)$

Step4: Remove fraction

Multiply all by 2: $4\text{HBr}(aq) + \text{O}_2(g)
ightarrow 2\text{H}_2\text{O}(l) + 2\text{Br}_2(l)$

Answer:

$4\text{HBr}(aq) + \text{O}_2(g)
ightarrow 2\text{H}_2\text{O}(l) + 2\text{Br}_2(l)$