posted by Shawn .
Hydrogen fluoride is used in the manufacture of Freons (which destroy ozone in the stratosphere) and in the production of aluminum metal. It is prepared by the reaction below.
CaF2 + H2SO4 CaSO4 + 2 HF
In one process 9.00 kg of CaF2 are treated with an excess of H2SO4 and yield 2.76 kg of HF. Calculate the percent yield of HF.
1. Convert 9.00 kg CaF2 to mols. mols = grams/molar mass.
2. Use the coefficients to convert mols CaF2 to mols HF.
3. Convert mols HF to grams. g = mols x molar mass and change to kg. This is the theoretical yield (TE)
4. %yield = (actual yield/TE)*100 = ?
I did that but i have no idea why my answer in wrong ? it should be 93 and i got 45