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Atoms and reactions

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Question 38

Hydrogen gas is widely studied as a clean alternative fuel. Which industrial chemical process is the most sustainable in terms of the atom economy of the hydrogen produced?

Use the following relative atomic masses: H=1.0H = 1.0H=1.0, C=12.0C = 12.0C=12.0, O=16.0O = 16.0O=16.0.

A

CH4+H2O→CO+3H2\text{CH}_4 + \text{H}_2\text{O} \rightarrow \text{CO} + 3\text{H}_2CH4​+H2​O→CO+3H2​

B

CH4→C+2H2\text{CH}_4 \rightarrow \text{C} + 2\text{H}_2CH4​→C+2H2​

C

C+H2O→CO+H2\text{C} + \text{H}_2\text{O} \rightarrow \text{CO} + \text{H}_2C+H2​O→CO+H2​

D

CO+H2O→CO2+H2\text{CO} + \text{H}_2\text{O} \rightarrow \text{CO}_2 + \text{H}_2CO+H2​O→CO2​+H2​

Markscheme

Atoms and reactions Questions

  1. A Level
  2. /Chemistry
  3. /Atoms and reactions

199 exam-style questions on OCR A A Level Chemistry Atoms and reactions, covering Atomic structure and isotopes, Compounds, formulae and equations, Amount of substance, Acids, and Redox. Each one has a worked solution and a mark scheme showing where the marks go.

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