During the synthesis of an industrial dehydrating agent, 1.24 g of phosphorus reacts completely with 1.60 g of oxygen to form a phosphorus oxide.
The relative formula mass (MrM_rMr) of this phosphorus oxide is 284.
Deduce the molecular formula of this phosphorus oxide.
You must show your working. (Relative atomic masses: P=31\text{P} = 31P=31, O=16\text{O} = 16O=16)
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.