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Hydrogen fluoride is used in the manufacture of Freons (which destroy ozone in the stratosphere) andin the production of aluminum metal. It is prepared by the reactionCaF2H2SO4 -» C2SO4 + 2HFIn one process, 5.75 kg of CaF2 is treated with an excess of H2SO4 and yields 2.85 kg of HF. Calculatethe percent yield of HF.% yield

Question
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 -» C2SO4 + 2HF
In one process, 5.75 kg of CaF2 is treated with an excess of H2SO4 and yields 2.85 kg of HF. Calculate
the percent yield of HF.
% yield
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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 -» C2SO4 + 2HF In one process, 5.75 kg of CaF2 is treated with an excess of H2SO4 and yields 2.85 kg of HF. Calculate the percent yield of HF. % yield

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Step 1
The moles Caf is calculated as
elowe
Caf Given Mass
Molar Mass
Moles
looo
5.75
X
78.08
3.64 Mol
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The moles Caf is calculated as elowe Caf Given Mass Molar Mass Moles looo 5.75 X 78.08 3.64 Mol

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Step 2
Giuen reaction is Caft0CasOy +2HF
Mole Caf produces 2 moles
is aleulated as
2 moles
The
Accordling to it
MF Themoles
ellons
HЕ
mole
cф Сaf
3-64 Mole Caf (2x13. 64) mobs HE
47.28 mo
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Giuen reaction is Caft0CasOy +2HF Mole Caf produces 2 moles is aleulated as 2 moles The Accordling to it MF Themoles ellons HЕ mole cф Сaf 3-64 Mole Caf (2x13. 64) mobs HE 47.28 mo

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Step 3
moles x molar mass
mol
47-25 mel x 20.0
HE
The mass
2947.01
2.95
the theorlical
HF is a
Therefore
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moles x molar mass mol 47-25 mel x 20.0 HE The mass 2947.01 2.95 the theorlical HF is a Therefore

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