Question

Oxygen oxidase ethyne to carbon dioxide and water as shown by the equation :
2C₂H₂ + 5O₂ → 4CO₂ + 2H₂O
What volume of ethylene gas at STP is required to produce 8.4 dm³ of carbon dioxide at STP?

Answer 1

2C₂H₂ + 5O₂ → 4CO₂ + 2H₂O
2 moles of C₂H₂ = 4 mole of CO₂
X dm³ of C₂H₂ = 8.4 dm³ of CO_{2
X =} `[2 xx 8.4]/4` 
= 4.2 dm³ of C₂H₂