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6.4 Chemical cells and fuel cells

6.4 Chemical cells and fuel cells

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Question 8
H

In an acidic hydrogen-oxygen fuel cell, oxygen reacts at the positive electrode. O2+4H++4e−→2H2O\mathrm{O_{2} + 4H^{+} + 4e^{-} \rightarrow 2H_{2}O}O2​+4H++4e−→2H2​O Relative atomic mass: O = 16. Avogadro constant = 6.02 × 1023 per mole.

How many electrons are gained when 0.100 g of oxygen reacts?

[1]
A

1.88×10211.88\times10^{21}1.88×1021

B

3.76×10213.76\times10^{21}3.76×1021

C

7.53×10217.53\times10^{21}7.53×1021

D

1.51×10221.51\times10^{22}1.51×1022

Markscheme

6.4 Chemical cells and fuel cells Questions

  1. GCSE
  2. /Chemistry
  3. /6.4 Chemical cells and fuel cells

42 exam-style questions on Edexcel GCSE Chemistry 6.4 Chemical cells and fuel cells, covering 6.4.1 Chemical cells and fuel cells. Each one has a worked solution and a mark scheme showing where the marks go.

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