A technician needs to label a bottle of calcium chloride solution.
The solution contains 0.200 mol of calcium chloride in each dm3\mathrm{dm^3}dm3.
Given Mr(CaCl2)=111M_r(\mathrm{CaCl_2})=111Mr(CaCl2)=111, what mass concentration should be written on the label?
0.200 g dm−30.200\,\mathrm{g\,dm^{-3}}0.200gdm−3
111 g dm−3111\,\mathrm{g\,dm^{-3}}111gdm−3
22.2 g dm−322.2\,\mathrm{g\,dm^{-3}}22.2gdm−3
1.80×10−3 g dm−31.80\times10^{-3}\,\mathrm{g\,dm^{-3}}1.80×10−3gdm−3
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.