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3 Quantitative chemistry

3 Quantitative chemistry

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Question 75

In analytical chemistry, hydrated ammonium iron(II) sulfate (commonly known as Mohr's salt) is widely used as a primary standard in redox titrations because of its stability against oxidation in air.

What is the relative formula mass (MrM_rMr​) of Mohr's salt, (NH4)2Fe(SO4)2⋅6H2O(\text{NH}_4)_2\text{Fe}(\text{SO}_4)_2 \cdot 6\text{H}_2\text{O}(NH4​)2​Fe(SO4​)2​⋅6H2​O?

Relative atomic masses (ArA_rAr​):

  • H=1.0\text{H} = 1.0H=1.0
  • N=14.0\text{N} = 14.0N=14.0
  • O=16.0\text{O} = 16.0O=16.0
  • S=32.1\text{S} = 32.1S=32.1
  • Fe=55.8\text{Fe} = 55.8Fe=55.8
A

284.0284.0284.0

B

312.0312.0312.0

C

378.0378.0378.0

D

392.0392.0392.0

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3 Quantitative chemistry Questions

  1. GCSE
  2. /Chemistry
  3. /3 Quantitative chemistry

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