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2.3 Ionic bonding

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Question 8

A technician checks the composition data recorded for potassium nitrate, KNO3\mathrm{KNO_3}KNO3​, in a chemical storeroom.

The relative formula mass, MrM_rMr​, of potassium nitrate is 101.

ElementRelative atomic mass (ArA_rAr​)
O\mathrm{O}O16

Calculate what percentage of the mass of potassium nitrate is made up of oxygen.

Give your answer to three significant figures.

[2]
Markscheme

2.3 Ionic bonding Questions

  1. GCSE
  2. /Chemistry
  3. /2.3 Ionic bonding

119 exam-style questions on Edexcel GCSE Chemistry 2.3 Ionic bonding, covering 2.3.1 Ions and the formation of ionic bonds, 2.3.2 Naming and deducing formulae of ionic compounds, and 2.3.3 Giant ionic lattices. Each one has a worked solution and a mark scheme showing where the marks go.

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