Question

Acetylene gas (C2H2) is used in welding torches. When it reacts with oxygen, it produces

carbon dioxide (CO2) and steam (H20). The reaction can be described by the equation 2C2H2+
502 —> 4CO2 + 2H20. How much mass of C2H2 is needed to produce 75.0 grams of CO2?

Answer 1

Mass C₂H₂ needed : 22.165 g

Further explanation

Reaction

2C₂H₂+ 5O₂ ⇒ 4CO₂ + 2H₂O

75.0 grams of CO₂ , mol CO₂ (MW=44 g/mol) :

`\tt (75)/(44)=1.705`

mol C₂H₂ :

`\tt (2)/(4)* 1.705=0.8525`

mass C₂H₂ (MW=26 g/mol) :

`\tt 0.8525* 26=22.165~g`