(Answered) Hdrogen fluoride is used in the manufacture of freons

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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 CaF2 + H2SO4 -> CaSO4 + 2HF

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

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