Waec Model Questions Vol1 2021 Chemistry Question 25
Practice objective / multiple choice question 25 from the 2021 Waec Model Questions Vol1 Chemistry examination.
A 5.00 g sample of a mixture containing CaCO₃ and Na₂CO₃ is heated so that both carbonates decompose: CaCO₃ → CaO + CO₂ and Na₂CO₃ → Na₂O + CO₂. The total volume of CO₂ collected over water at 25 °C and 760 mmHg is 1.68 L. Assuming the overall decomposition yield is 85 % (the same for both carbonates), calculate the mass of CaO obtained (to three significant figures).
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About This Question
This is Waec Model Questions Vol1 2021 Chemistry Question 25. It is one of the objective questions from the 2021 Waec Model Questions Vol1 Chemistry examination.
Difficulty level: Medium .
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