Oxy acetylene welding uses acetylene gas which is produced by the reaction of CaC2 with water. It also produces calcium hydroxide as a by product.Calculate the volume in liters measured at 27°C and 965 torr that would be produced from the complete reaction of 11.2 g of CaC2 with 6.23g of H2O.
This is a limiting reagent (LR) problem and you know that because amounts are given for BOTH reactants. In this case, however, the exact amounts are given. Therefore, you may use either water or CaC2 to start.
CaC2 + 2H2O ==> Ca(OH)2 + C2H2
mols CaC2 = grams/molar mass = ?
Using the coefficients in the balanced equation, convert mols CaC2 to mols C2H2.
Now use PV = nRT to convert mols C2H2 to V (in L) at the conditions listed in the problem.