Limescale can be removed from plumbing systems by treating it with dilute hydrochloric acid. One of the soluble products formed in this reaction is calcium chloride, CaCl2\text{CaCl}_2CaCl2. Calculate the relative formula mass (MrM_rMr) of calcium chloride. (Relative atomic masses: Ca=40\text{Ca} = 40Ca=40, Cl=35.5\text{Cl} = 35.5Cl=35.5)
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.