An archaeologist recovers a sample of a tarnished copper-based artifact from an ancient excavation site. Chemical analysis reveals that the dark tarnish is a copper sulfide compound.
A 1.59 g sample of this copper sulfide is analyzed and found to contain 1.27 g of copper atoms, with the remainder of the mass consisting of sulfur atoms.
Calculate the empirical formula of this copper sulfide compound. (Relative atomic masses: Cu=63.5\text{Cu} = 63.5Cu=63.5, S=32.0\text{S} = 32.0S=32.0)
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.