Hydrogen fluoride is used in the manufacture of Freons (which destroy ozone in the stratos...

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

In one process, 6.00 kg of CaF₂ are treated with an excess of H₂SO₄ to yield 2.86 kg of HF. Calculate the percent yield of HF.