The mass of C₂H₂ that would be produced by complete reaction of 3.75 g of calcium carbide is 1.524 grams
calculation
calcium carbide (CaC₂) react with water(H₂O) to produce C₂H₂ and Ca(OH)₂ according to reaction below
CaC₂ +2H₂O C₂H₂ + Ca(OH)₂
calculate the moles of CaC₂
moles = mass÷ molar mass
from periodic table the molar mass of CaC₂ = 40 + (12 x2) = 64 g/mol
moles is therefore =3.75 g÷ 64 g/mol =0.0586 moles
Use the mole ratio to determine the moles of C₂H₂
from equation above CaC₂: C₂H₂ is 1:1 therefore the moles of C₂H₂ is also
= 0.0586 moles
mass of C₂H₂ = moles x molar mass
from periodic table the molar mass of C₂H₂ = (12 x 2) + (1 x 2) = 26 g/mol
mass =0.0586 moles x 26 g/mol =1.524 grams
