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

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Question 28

Four portions of pure molecular substances are prepared for separate reactions.

Relative atomic masses (ArA_rAr​): H=1\text{H} = 1H=1, C=12\text{C} = 12C=12, O=16\text{O} = 16O=16, Cl=35.5\text{Cl} = 35.5Cl=35.5

SampleSubstanceMass
Pwater, H2O\text{H}_2\text{O}H2​O9.0 g
Qcarbon dioxide, CO2\text{CO}_2CO2​13.2 g
Rethane, C2H6\text{C}_2\text{H}_6C2​H6​9.0 g
Shydrogen chloride, HCl\text{HCl}HCl3.65 g

Which pair of samples contains the same number of particles?

[1]
A

Samples Q and R

B

Samples Q and S

C

Samples P and Q

D

Samples P and R

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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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