Question

2c₂h₂(g) + 5o₂(g) → 4co₂(g) + 2h₂o(g)
how many liters of c₂h₂ are
required to produce 12.0 mol co₂,
assuming the reaction is at stp?
? l c₂h₂

Explanation:

Step1: Find mole ratio of C₂H₂ to CO₂

From reaction: 2 mol C₂H₂ → 4 mol CO₂ → ratio = 2/4 = 1/2

Step2: Calculate moles of C₂H₂ needed

Moles of C₂H₂ = 12.0 mol CO₂ × (1/2) = 6.0 mol

Step3: Convert moles to liters at STP

1 mol gas = 22.4 L at STP → Volume = 6.0 mol × 22.4 L/mol = 134.4 L

Answer:

134.4 L C₂H₂