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3.1 Introducing chemical reactions

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Question 28

Hydrogen chloride has the formula HCl.

The Avogadro constant is 6.02 × 10²³.

Relative atomic masses (Aᵣ): H = 1.0, Cl = 35.5

A chemist wants to know the mass of a single molecule of hydrogen chloride.

Calculate this mass in grams.

Give your answer in standard form to 3 significant figures.

Mass of one molecule = ...... g

[2]
Markscheme

3.1 Introducing chemical reactions Questions

  1. GCSE
  2. /Chemistry
  3. /3.1 Introducing chemical reactions

134 exam-style questions on OCR GCSE Chemistry 3.1 Introducing chemical reactions, covering 3.1.1 Writing formulae and balanced chemical equations, 3.1.2 Formulae of compounds from ions, and state symbols, 3.1.3 Conservation of mass and observed changes in mass, 3.1.4 Half equations and balanced ionic equations, 3.1.5 The mole and the Avogadro constant, and 3.1.6 Stoichiometry, limiting reactants and reacting masses. Each one has a worked solution and a mark scheme showing where the marks go.

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