Question

Acetylene (C2H2) gas is often used in welding torches because of the very high heat produced when it reacts with oxygen (O2) gas, producing carbon dioxide gas and water vapor. Calculate the moles of acetylene needed to produce 0.10 mol of carbon dioxide. Be sure your answer has a unit symbol

Answer 1

Answer:

0.05 mol

Explanation:

The balanced equation for the reaction that takes place is:

• 2C₂H₂ (g) + 5O₂ (g) → 4CO₂ (g) + 2H₂O (g)

Now we convert 0.10 moles of carbon dioxide (CO₂) into moles of acetylene (C₂H₂), using the stoichiometric coefficients of the balanced reaction:

• 0.10 mol CO₂ * $\frac{2molC_2H_2}{4molCO_2}$ = 0.05 mol C₂H₂