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ZIMSEC A-Level Chemistry

6.1.1.4Stoichiometric calculations and reaction ratios; percentage yield and percentage purity

Stoichiometric calculations and reaction ratios; percentage yield and percentage purity in ZIMSEC A-Level Chemistry: what the syllabus expects you to know, the learning objectives and how to practise.
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Learning objectives

What the syllabus expects you to be able to do.

  1. 6.1.1.4.1Use the mole concept to calculate reacting masses and volumes of gases (Form 5, revisited in Form 6).
  2. 6.1.1.4.2Determine stoichiometric relationships from calculations and experimental data.
  3. 6.1.1.4.3Calculate percentage yield and percentage purity (Form 6).

Lessons

  • Reacting masses, gas volumes, yield and purity

    45 min

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Sample question

A sample question on this topic. Answer it, check it, then read the worked answer.

Stoichiometric calculations and reaction ratios; percentage yield and percentage purity: sample question

1 mark

What volume of hydrogen, measured at room conditions, is produced when 0.243 g of magnesium reacts with excess dilute hydrochloric acid? (Ar: Mg 24.3)

Mg(s)+2 HCl(aq)→MgClX2(aq)+HX2(g)\ce{Mg(s) + 2HCl(aq) -> MgCl2(aq) + H2(g)}

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