Question

13.7.04.4 Limiting Reagents, Aqueous Reactions Soved 02 points Report p Enter your answer in the provided ber. Hydrogen fluoride is used in the manufacture of Freons (which destroyerose in the stratosphere) and in the production of aluminum metal. It is prepared by the reaction CaF, H,SO-CaSO+ 2HF 2013050 Hint eBook Ta one process, 6.15 kg of CaF, is treated with an excess of H,SO, and yields 2.85 kg of H. Calealate the percent yield of HF. Would you like try another ve of this question % yield By doing so, you and lose all po associated with question Thy another < Prev Type here to search che NO 2 of 10 !!! Next >

Answer 1

Percent yield=(actual yield/theoritical yield)100

Actula yield = 2.5kg

step(1) Calculation for theoritical yield

mass of CaF​​​​2= 6.15kg

we know that ,

Mola mass of CaF​​​​2= 78.07 g/mol

Molar mass of HF = 20.1g/mol

From the stoichiometric of chemical reaction

1mol ​​​of CaF​​​​2 produced 2mol of HF

Or

78.07 g CaF​​​​2 (i.e mass of 1mol CaF​​​​2 ) produced 2(20.1)g HF (i.e mass of 2 mol HF)

78.07 g CaF​​​​2 produced 40.2 g HF

Or

70.07kg CaF​​​​2 produced 40.2kg HF

So,

1.0kg CaF​​​​2 produced (40.2/70.07) kg of HF

So,

6.15 kg of CaF​​​​2 produced (40.2/70.07)6.15kg of HF

theoritical yield of HF = (40.2/70.07)6.15kg

Theoritical yield of HF = 3.53kg

Hence,

Percent yield =[ (2.5kg)/(3.53kg)]×100

PERCENT YIELD = 70.85%