In one process, 5.95 kg of caf2 is treated with an excess of h2so4 and yields 2.45 kg of hf. calculate the percent yield of hf.

Question

Chemistry

Marvin Michael

9 March, 19:15

In one process, 5.95 kg of caf2 is treated with an excess of h2so4 and yields 2.45 kg of hf. calculate the percent yield of hf.

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Nikolai Rubio · Answer 1

Answer is: yield of reaction is 80,3%.

Chemical reaction: CaF₂ + H₂SO₄ → CaSO₄ + 2HF.

m (CaF₂) = 5,95 kg · 1000 g/kg = 5950 g.

n (CaF₂) = m (CaF₂) : M (CaF₂).

n (CaF₂) = 5950 g : 78 g/mol.

n (CaF₂) = 76,28 mol.

From chemical reaction: n (CaF₂) : n (HF) = 1 : 2.

n (HF) = 76,28 mol · 2 = 152,56 mol.

m (HF) = 152,56 mol · 20 g/mol.

m (HF) = 3051,2 g : 1000 g/kg = 3,0512 kg.

yield = 2,45 kg kg : 3,0512 kg · 100% = 80,3%.