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Calculations involving masses

Calculations involving masses

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Question 72

Calculate the percentage by mass of potassium in potassium carbonate, K2CO3\text{K}_2\text{CO}_3K2​CO3​.

percentage by mass of element=total relative atomic mass of elementrelative formula mass of compound×100 \text{percentage by mass of element} = \frac{\text{total relative atomic mass of element}}{\text{relative formula mass of compound}} \times 100 percentage by mass of element=relative formula mass of compoundtotal relative atomic mass of element​×100

(Relative atomic masses: C=12\text{C} = 12C=12, O=16\text{O} = 16O=16, K=39\text{K} = 39K=39)

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Calculations involving masses Questions

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

258 exam-style questions on Edexcel GCSE Chemistry Calculations involving masses. Each one has a worked solution and a mark scheme showing where the marks go.

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