Homework Help: Chemistry

Posted by Shawn on Tuesday, August 7, 2012 at 2:52pm.

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.

Chemistry - DrBob222, Tuesday, August 7, 2012 at 3:07pm
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 = ?

4.
Chemistry - Anonymous, Wednesday, March 6, 2013 at 8:13am
I did that but i have no idea why my answer in wrong ? it should be 93 and i got 45

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