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3.3 Yield and atom economy of chemical reactions

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Question 11

Sodium carbonate is made by heating sodium hydrogencarbonate.

2NaHCO3→Na2CO3+H2O+CO2\mathrm{2NaHCO_3 \rightarrow Na_2CO_3 + H_2O + CO_2}2NaHCO3​→Na2​CO3​+H2​O+CO2​

Relative atomic masses (ArA_rAr​): H = 1, C = 12, O = 16, Na = 23

a.

Calculate the percentage atom economy for making sodium carbonate.

[3]
b.

A company completely reacts 420 kg of sodium hydrogencarbonate. No substances are lost.

Calculate the total mass of unwanted by-products formed.

[2]
Markscheme

3.3 Yield and atom economy of chemical reactions Questions

  1. GCSE
  2. /Chemistry
  3. /3.3 Yield and atom economy of chemical reactions

104 exam-style questions on AQA GCSE Chemistry 3.3 Yield and atom economy of chemical reactions, covering 3.3.1a Percentage yield, 3.3.1b Theoretical mass of a product, 3.3.2a Atom economy, and 3.3.2b Choosing a reaction pathway. Each one has a worked solution and a mark scheme showing where the marks go.

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