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6.2 Quantitative analysis

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Question 2

A route to make coating material K also forms by-product L. The masses of K and L are represented by mK m_K\,mK​ and mLm_LmL​.

Which expression gives the atom economy for K?

[1]
A

mLmK+mL×100\frac{m_L}{m_K+m_L}\times100mK​+mL​mL​​×100

B

mKmK+mL×100\frac{m_K}{m_K+m_L}\times100mK​+mL​mK​​×100

C

mK+mLmK×100\frac{m_K+m_L}{m_K}\times100mK​mK​+mL​​×100

D

mKmL×100\frac{m_K}{m_L}\times100mL​mK​​×100

Markscheme

6.2 Quantitative analysis Questions

  1. GCSE
  2. /Chemistry
  3. /6.2 Quantitative analysis

151 exam-style questions on Edexcel GCSE Chemistry 6.2 Quantitative analysis, covering 6.2.1 Concentration in mol dm⁻³ and titration calculations, 6.2.2 Percentage yield and why actual yield falls short, 6.2.3 Atom economy of a reaction, 6.2.4 Choosing a reaction pathway, and 6.2.5 Molar volume of gases and Avogadro's law. Each one has a worked solution and a mark scheme showing where the marks go.

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