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3.1 Introducing chemical reactions

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Question 21
H

Sodium hydrogencarbonate decomposes when it is heated.

2NaHCO3→Na2CO3+H2O+CO2 \mathrm{2NaHCO_{3} \rightarrow Na_{2}CO_{3} + H_{2}O + CO_{2}} 2NaHCO3​→Na2​CO3​+H2​O+CO2​

What mass of sodium carbonate forms when 8.40 g of sodium hydrogencarbonate decomposes completely?

Relative atomic mass (ArA_rAr​): H = 1.0 C = 12.0 O = 16.0 Na = 23.0

[1]
A

4.20 g

B

5.30 g

C

10.6 g

D

21.2 g

Markscheme

3.1 Introducing chemical reactions Questions

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

55 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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