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Problem: Hydrogen fluoride is used in the manufacture of Freon (which also destroys ozone in the stratosphere) and in the production of aluminum metal. It is prepared by the reaction CaF2 + H2SO4      →      CaSO 4 + 2HF  In one process, 6.00 kg of CaF 2 are treated with an excess of H 2SO4 and yield 2.86 kg of HF. Calculate the percent yield of HF. a) 76.3% b) 83.6% c) 89.2% d) 93.0% e) 97.8%

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Problem Details

Hydrogen fluoride is used in the manufacture of Freon (which also destroys ozone in the stratosphere) and in the production of aluminum metal. It is prepared by the reaction

CaF2 + H2SO4      →      CaSO 4 + 2HF 

In one process, 6.00 kg of CaF 2 are treated with an excess of H 2SO4 and yield 2.86 kg of HF. Calculate the percent yield of HF.

a) 76.3%

b) 83.6%

c) 89.2%

d) 93.0%

e) 97.8%

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