Need help ASAP with chem work

Question

Balance: CaC₂+H2O—>Ca(OH)2+C2H2

if there is 40.0g of calcium carbide(CaC2), what mass of calcium hydroxide(Ca(OH2) can be formed

Answer 1

Just add 2 in front of water: CaC₂ + 2 H₂O --> Ca(OH)₂ + C₂H₂. Then (40g CaC₂) * (1 mol CaC₂ / 64.1g CaC₂) * (1 mol Ca(OH)₂ /1 mol CaC₂) * (74.1g Ca(OH)₂ /1 mol Ca(OH)₂) = 46.2g Ca(OH)₂.