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5.2 Chemical cells and fuel cells

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Question 16

A computer model is used to study an acidic hydrogen fuel cell. During one interval, 3.0 × 1020 hydrogen molecules react at the hydrogen electrode.

The half equation at the oxygen electrode is:

O2+4H++4e−→2H2O\text{O}_2 + 4\text{H}^+ + 4\text{e}^- \rightarrow 2\text{H}_2\text{O}O2​+4H++4e−→2H2​O

a.

Calculate the number of electrons released at the hydrogen electrode during this interval.

[2]
b.

Calculate the number of oxygen molecules that react during this interval.

[2]
Markscheme

5.2 Chemical cells and fuel cells Questions

  1. GCSE
  2. /Chemistry
  3. /5.2 Chemical cells and fuel cells

90 exam-style questions on AQA GCSE Chemistry 5.2 Chemical cells and fuel cells, covering 5.2.1 Cells and batteries, 5.2.2a Fuel cells, and 5.2.2b Half equations for hydrogen fuel cells. Each one has a worked solution and a mark scheme showing where the marks go.

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