How many grams of carbon dioxide would be formed if 38.9 g C2H2 reacted completely with oxygen

2C₂H₂ + 5O₂ = 4CO₂ + 2H₂O

m (CO₂) / {4M (CO₂) } = m (C₂H₂) / {2M (C₂H₂) }

m (CO₂) = 2M (CO₂) m (C₂H₂) / M (C₂H₂)

m (CO₂) = 2*44g/mol*38.9g/26g/mol = 131.7 g

131.7 grams of carbon dioxide would be formed