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Edexcel A-Level Chemistry AS 1.2 The Mole Mol Is the Unit for the Amount of a Substance Questions

Convert the given quantity to mass or volume if needed, divide by molar mass to obtain moles and multiply by the Avogadro constant and particle ratio.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
AS

Exam points

  • Calculate atoms, molecules or ions using moles and the Avogadro constant.
  • Convert density and volume to mass before calculating amount and particle number.
  • Calculate mole percentages or particles per object from mixed quantitative data.

Edexcel A-Level Chemistry AS 1.2 The Mole Mol Is the Unit for the Amount of a Substance Questions question 1

[Maximum number: 2]

This question is about ethene, C2H4\mathrm{C}_{2} \mathrm{H}_{4}.

The global production of ethene is about 150 million tonnes per year.

Calculate the number of molecules in 150 million tonnes of ethene.
[1\left[1\right. tonne =1000 kg=1000 \mathrm{~kg} \quad Avogadro constant =6.02×1023 mol−1]\left.=6.02 \times 10^{23} \mathrm{~mol}^{-1}\right]

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