Neco Model Questions Vol1 2017 Chemistry Question 5

Practice essay / theory question 5 from the 2017 Neco Model Questions Vol1 Chemistry examination. This question covers Stoichiometry .

Neco Model Questions Vol1 2017 Chemistry Essay / Theory

Topic: Stoichiometry

Question 5 NECO_MODEL_QUESTIONS_VOL1 • 2017 • CHEMISTRY • essay

A 15.0 g sample of impure calcium carbonate (CaCO₃) is heated to decompose it according to CaCO₃(s) → CaO(s) + CO₂(g). The sample is 80 % pure CaCO₃ by mass. After heating, 5.0 g of CaO is collected.

Question Parts

( a )

Determine the theoretical mass of CaO that could be obtained from the pure CaCO₃ present in the sample.

( b )

Calculate the percent yield of CaO based on the actual mass obtained.

( c )

If the same 15.0 g impure sample were instead reacted with excess hydrochloric acid according to CaCO₃ + 2 HCl → CaCl₂ + H₂O + CO₂, determine the theoretical mass of CaCl₂ that could be formed and discuss which method (heating vs acid) gives a higher efficiency, assuming 100 % yield for the acid reaction.

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About This Question

This is Neco Model Questions Vol1 2017 Chemistry Question 5. It is one of the essay questions from the 2017 Neco Model Questions Vol1 Chemistry examination.

The question covers Stoichiometry .

View More Neco Model Questions Vol1 2017 Chemistry Questions More Neco Model Questions Vol1 Practice Questions Back to Questions

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