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3.1 Introducing chemical reactions

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Question 7

Sodium hydroxide reacts with sulfuric acid.

H2SO4+2NaOH→Na2SO4+2H2O \mathrm{H_{2}SO_{4} + 2NaOH \rightarrow Na_{2}SO_{4} + 2H_{2}O} H2​SO4​+2NaOH→Na2​SO4​+2H2​O

Sulfuric acid is in excess.

Relative atomic mass (ArA_rAr​): H = 1.0 O = 16.0 Na = 23.0 S = 32.0

A student obtains 14.2 g of sodium sulfate. What mass of sodium hydroxide was used up?

[1]
A

8.00 g

B

14.2 g

C

28.4 g

D

4.00 g

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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