Question

3.84 Two successive reactions, A - B and B - C, have yields of 73% and 68%, respectively. What is the overall percent yield for conversion of A to C?

Answer 1

Question 3.84

Let us take 100 gm of compound

A ====> B  

The yield is 73 %. The weight of the compound is 73 gm which is subjected to second step

B =======> C

The yield is 68 %. The obtained weight of the compound is 49.64 gm.

The overall percentage yield of the reaction is 49.64 %.

Question 3.87

Balanced equation:
PCl₃ + 3 H₂O ====> H₃PO₃ + 3 HCl
Reaction type: double replacement

Mass of PCl3 = 200 gm

Moles of PCl3 = 200 gm / 137.33 gm/mol =  1.4563 moles

Moles of HCl produced =  4.3689 Moles

Theoretical yield of the reaction =  4.3689 Moles x 36.45 gm/mol =  159.29 gm

The actual yield of the reaction = 128gm

The percentage yield of the reaction = 128 gm x 100 % / 159.29 gm = 80.35 %

Balanced equation: PCl3 + 3 H20= H3PO3 + 3 HCI Reaction type: double replacement Reaction stoichiometry Limiting reagent Compound Coefficient Molar Mass Moles Weight PCI; 137.332762 1.456317 200.0001 HO 18.01528 4.368952 78.70790 H3PO3 81.995782 1.456317 119.4119 HCI 36.46094 4.368952 159.2961 Units: molar mass - g/mol, weight - g.