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

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Question 14

A chemical supplier is completing the quantity records for two sealed samples. The available information is shown in the table.

SampleSubstanceFormulaRecorded information
PHydrogen sulfideH2S\text{H}_2\text{S}H2​SMass = 85.0 g
QLithium bromideLiBr\text{LiBr}LiBrAmount = 0.300 mol
ElementH\text{H}HLi\text{Li}LiS\text{S}SBr\text{Br}Br
Relative atomic mass (ArA_rAr​)173280
a.

Calculate the number of moles in sample P.

[2]
b.

The relative formula mass is missing from the record for sample Q. Calculate Mr M_r\,Mr​ for this sample.

[1]
c.

The mass is also missing from the record for sample Q. Calculate the mass of this sample.

[2]
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3.2 Use of amount of substance in relation to masses of pure substances Questions

  1. GCSE
  2. /Chemistry
  3. /3.2 Use of amount of substance in relation to masses of pure substances

131 exam-style questions on AQA GCSE Chemistry 3.2 Use of amount of substance in relation to masses of pure substances, covering 3.2.1 Moles, 3.2.2 Amounts of substances in equations, 3.2.3 Using moles to balance equations, 3.2.4 Limiting reactants, 3.2.5a Concentration of solutions, and 3.2.5b Relating mass, volume and concentration. Each one has a worked solution and a mark scheme showing where the marks go.

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