Use of amount of substance in relation to masses of pure substances

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Question 30
Medium

A student investigated the reaction of iron with bromine gas.

The word equation for the reaction is:

iron+bromine→iron bromide \text{iron} + \text{bromine} \rightarrow \text{iron bromide} iron+bromine→iron bromide

The student weighed:

  • the glass tube
  • the glass tube and iron before the reaction
  • the glass tube and iron bromide after the reaction

The table below shows the student's results:

Mass in g\text{g}g
Glass tube25.30
Glass tube and iron28.10
Glass tube and iron bromide40.10

Calculate the simplest whole number ratio of:

moles of iron atoms:moles of bromine atoms \text{moles of iron atoms} : \text{moles of bromine atoms} moles of iron atoms:moles of bromine atoms

Determine the balanced chemical equation for the reaction.

Relative atomic masses (ArA_rAr​): Br=80\text{Br} = 80Br=80, Fe=56\text{Fe} = 56Fe=56

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Use of amount of substance in relation to masses of pure substances Questions

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