In an analytical test, 2.0 g of element M reacted completely with 1.9 g of element X to form a compound. Calculate the empirical formula of this compound. (relative atomic masses: M = 40, X = 19) You must show your working.
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.