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2.6 Calculations involving masses

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Question 8
F

Magnesium combines with oxygen. A sample contains 24 g of magnesium and 16 g of oxygen. Use Mg=24\mathrm{Mg} = 24Mg=24 and O=16\mathrm{O} = 16O=16. What is the empirical formula?

[1]
A

MgO\mathrm{MgO}MgO

B

Mg2O\mathrm{Mg_{2}O}Mg2​O

C

MgO2\mathrm{MgO_{2}}MgO2​

D

Mg2O3\mathrm{Mg_{2}O_{3}}Mg2​O3​

Markscheme

2.6 Calculations involving masses Questions

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

55 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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