A technician has 300 cm3300\,\mathrm{cm^{3}}300cm3 of ammonium chloride solution with a concentration of 0.0800 mol dm−30.0800\,\mathrm{mol\,dm^{-3}}0.0800moldm−3. The technician adds solid ammonium chloride and water until the total volume is 500 cm3500\,\mathrm{cm^{3}}500cm3 and the concentration is 0.150 mol dm−30.150\,\mathrm{mol\,dm^{-3}}0.150moldm−3. The relative formula mass of ammonium chloride is 53.5.
Calculate the mass of ammonium chloride the technician must add.
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.