Neco 2021 Chemistry Question 31

Practice objective / multiple choice question 31 from the 2021 Neco Chemistry examination.

Neco 2021 Chemistry Objective / Multiple Choice Hard Difficulty
Question 31 NECO • 2021 • CHEMISTRY • objective

A mixture contains 2.00\,g of phosphorus (P\(_4\)) and 3.00\,g of chlorine gas (Cl\(_2\)). They react according to the balanced equation \(\mathrm{P_4 + 6 Cl_2 \rightarrow 4 PCl_3}\). (a) Identify the limiting reagent. (b) Calculate the theoretical mass of phosphorus trichloride (PCl\(_3\)) that can be formed. (c) If the actual yield is 85\,%, determine the mass of PCl\(_3\) obtained.

Answer Options

A. Limiting reagent: Cl₂; theoretical PCl₃ = 3.87 g; actual PCl₃ (85 % yield) = 3.10 g
B. Limiting reagent: Cl₂; theoretical PCl₃ = 3.20 g; actual PCl₃ (85 % yield) = 2.72 g
C. Limiting reagent: P₄; theoretical PCl₃ = 4.12 g; actual PCl₃ (85 % yield) = 3.50 g
Correct Answer D. Limiting reagent: Cl₂; theoretical PCl₃ = 3.87 g; actual PCl₃ (85 % yield) = 3.29 g
Correct Answer
D
Correct Option:
Limiting reagent: Cl₂; theoretical PCl₃ = 3.87 g; actual PCl₃ (85 % yield) = 3.29 g

About This Question

This is Neco 2021 Chemistry Question 31. It is one of the objective questions from the 2021 Neco Chemistry examination.

Difficulty level: Hard .

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