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Amount of substance

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Question 21

The reaction between iron(II) ions and dichromate(VI) ions in acidic solution can be represented by the equation:

6Fe2++Cr2O72−+14H+→6Fe3++2Cr3++7H2O 6\text{Fe}^{2+} + \text{Cr}_2\text{O}_7^{2-} + 14\text{H}^+ \rightarrow 6\text{Fe}^{3+} + 2\text{Cr}^{3+} + 7\text{H}_2\text{O} 6Fe2++Cr2​O72−​+14H+→6Fe3++2Cr3++7H2​O

What volume, in dm3\text{dm}^3dm3, of 0.050 mol dm-3 K2Cr2O7\text{K}_2\text{Cr}_2\text{O}_7K2​Cr2​O7​ is needed to oxidise 0.15 mol of iron(II) ions completely?

A

0.0250.0250.025

B

0.150.150.15

C

0.500.500.50

D

3.03.03.0

Markscheme

Amount of substance Questions

  1. A Level
  2. /Chemistry
  3. /Amount of substance

79 exam-style questions on AQA A Level Chemistry Amount of substance, covering Relative atomic mass and relative molecular mass, The mole and the Avogadro constant, The ideal gas equation, Empirical and molecular formula, and Balanced equations and associated calculations. Each one has a worked solution and a mark scheme showing where the marks go.

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