Neco 2020 Chemistry Question 44

Practice objective / multiple choice question 44 from the 2020 Neco Chemistry examination.

Neco 2020 Chemistry Objective / Multiple Choice Medium Difficulty
Question 44 NECO • 2020 • CHEMISTRY • objective

Calcium carbonate (\(\text{CaCO}_3\)) reacts with hydrochloric acid according to \(\text{CaCO}_3 + 2\text{HCl} \rightarrow \text{CaCl}_2 + \text{H}_2\text{O} + \text{CO}_2\). A sample of 10.0 g CaCO₃ is mixed with excess HCl and the carbon dioxide produced is collected over water at 25 °C. The total gas volume measured is 0.450 L at a total pressure of 760 mm Hg. The vapor pressure of water at 25 °C is 23.8 mm Hg. (a) Calculate the moles of CO₂ actually collected. (b) Determine the theoretical volume of CO₂ (at NTP, 22.4 L·mol⁻¹) from the given CaCO₃ mass. (c) Compute the percent yield of the reaction.

Answer Options

A. Moles CO₂ collected = 0.0160 mol; theoretical volume = 2.24 L; percent yield ≈ 16.0 %
Correct Answer B. Moles CO₂ collected = 0.0178 mol; theoretical volume = 2.24 L; percent yield ≈ 17.8 %
C. Moles CO₂ collected = 0.0178 mol; theoretical volume = 2.30 L; percent yield ≈ 15.5 %
D. Moles CO₂ collected = 0.0185 mol; theoretical volume = 2.24 L; percent yield ≈ 18.5 %
Correct Answer
B
Correct Option:
Moles CO₂ collected = 0.0178 mol; theoretical volume = 2.24 L; percent yield ≈ 17.8 %

About This Question

This is Neco 2020 Chemistry Question 44. It is one of the objective questions from the 2020 Neco Chemistry examination.

Difficulty level: Medium .

View More Neco 2020 Chemistry Questions More Neco Practice Questions Back to Questions

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Chat with Support