Neco 2020 Chemistry Question 4

Practice essay / theory question 4 from the 2020 Neco Chemistry examination. This question covers Mole Concept .

Neco 2020 Chemistry Essay / Theory
Topic: Mole Concept
Question 4 NECO • 2020 • CHEMISTRY • essay

A laboratory technician mixes 3.00 g of sodium carbonate (Na₂CO₃) with excess hydrochloric acid (HCl) in a sealed flask. The reaction proceeds according to: Na₂CO₃ + 2 HCl → 2 NaCl + CO₂ + H₂O After the reaction is complete, the flask is opened and the volume of the released carbon dioxide gas is measured at 25 °C and 1.00 atm. The volume recorded is 0.560 L. Answer the following questions:

Question Parts

( a )
Calculate the number of moles of Na₂CO₃ initially placed in the flask.
( b )
Using the ideal gas equation, determine the number of moles of CO₂ that were collected. Show all steps.
( c )
Identify the limiting reactant and calculate the theoretical mass of NaCl that could be formed from the reaction.
( d )
Explain why the mass of NaCl obtained experimentally might differ from the theoretical value calculated in part (c). List at least three possible sources of error.

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About This Question

This is Neco 2020 Chemistry Question 4. It is one of the essay questions from the 2020 Neco Chemistry examination.

The question covers Mole Concept .

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