Question

2c₂h₂(g) + 5o₂(g) → 4co₂(g) + 2h₂o(g)
assuming the reaction above occurs at stp, what is the ratio of c₂h₂ to co₂ from the balanced equation?
? l c₂h₂ : ? l co₂

Explanation:

Step1: Identify coefficients in balanced equation

From $2\text{C}_2\text{H}_2(g) + 5\text{O}_2(g)
ightarrow 4\text{CO}_2(g) + 2\text{H}_2\text{O}(g)$, coefficients of $\text{C}_2\text{H}_2$ and $\text{CO}_2$ are 2 and 4 respectively.

Step2: Simplify the ratio

Simplify $2:4$ by dividing both by 2, getting $1:2$.

Answer:

1 L $\text{C}_2\text{H}_2$ : 2 L $\text{CO}_2$