Skip to content

Course home

Question bank·3.3 Yield and atom economy of chemical reactions
Sign up

3.3 Yield and atom economy of chemical reactions

EasyMediumHard
1234567891011121314151617181920212223242526272829303132333435
Question 8

Potassium chlorate decomposes when heated. Oxygen is the desired product.

2KClO3→2KCl+3O22\text{KClO}_3 \rightarrow 2\text{KCl} + 3\text{O}_22KClO3​→2KCl+3O2​

A batch containing 24.5 kg of potassium chlorate is heated and the oxygen produced is collected.

Data itemValue
Mass of potassium chlorate heated24.5 kg
Mass of oxygen collected8.16 kg
Relative atomic mass of K39
Relative atomic mass of Cl35.5
Relative atomic mass of O16
a.

Calculate the percentage atom economy for the production of oxygen.

[3]
b.

Calculate the percentage yield of oxygen for this batch.

[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.

More questions