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3.3 Yield and atom economy of chemical reactions

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Question 6

A laboratory is comparing four chemical preparations. The required substance is written first on the right-hand side of each equation; any further substances are unwanted.

Which equation represents a reaction with an atom economy below 100 %?

[1]
A

SO3+H2O→H2SO4\mathrm{SO_3 + H_2O \rightarrow H_2SO_4}SO3​+H2​O→H2​SO4​

B

P4+6Cl2→4PCl3\mathrm{P_4 + 6Cl_2 \rightarrow 4PCl_3}P4​+6Cl2​→4PCl3​

C

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

D

N2O5+H2O→2HNO3\mathrm{N_2O_5 + H_2O \rightarrow 2HNO_3}N2​O5​+H2​O→2HNO3​

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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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