Question

if CaC2 + 2H2o -> C2H2 + Ca(OH) then how many grams of H2o are needed to react with 483 grams of calcium carbide?

Answer 1

mols CaC2 = grams/molar mass
Convert mols CaC2 to mols H2O using the coefficients.
Now convert mols H2O to grams. g = mols x molar mass.