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2.6 Calculations involving masses

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Question 15

A laboratory analyses molecular compound R, which has been isolated from a plant extract. Its empirical formula is C2H4O\mathrm{C_2H_4O}C2​H4​O and its relative molecular mass is 132.

ElementC\mathrm{C}CH\mathrm{H}HO\mathrm{O}O
Relative atomic mass, ArA_rAr​12116

What is the number of carbon atoms present in one molecule of R?

[1]
A

2 carbon atoms

B

3 carbon atoms

C

6 carbon atoms

D

12 carbon atoms

Markscheme

2.6 Calculations involving masses Questions

  1. GCSE
  2. /Chemistry
  3. /2.6 Calculations involving masses

142 exam-style questions on Edexcel GCSE Chemistry 2.6 Calculations involving masses, covering 2.6.1 Relative formula mass and percentage composition, 2.6.2 Empirical and molecular formulae, 2.6.3 Conservation of mass, 2.6.4 Reacting masses and concentration in g dm⁻³, 2.6.5 The mole and the Avogadro constant, and 2.6.6 Limiting reactants and stoichiometry. Each one has a worked solution and a mark scheme showing where the marks go.

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