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Cambridge AS & A Level Chemistry

2.4Reacting masses and volumes (of solutions and gases)

Reacting masses and volumes (of solutions and gases) in Cambridge AS & 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. 2.4.1Carry out mole calculations with reacting masses and percentage yield, gas volumes, solution volumes and concentrations, and limiting and excess reagents, to appropriate significant figures, and deduce stoichiometric relationships from them.

Lessons

  • Reacting masses, gas volumes, yield and purity

    45 min

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  • Solution concentrations and acid-base titration calculations

    45 min

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Sample question

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

Reacting masses and volumes (of solutions and gases): 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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