Tungsten is extracted from tungsten(VI) oxide using hydrogen gas. The balanced equation for the reaction is:
WO3+3H2→W+3H2O \text{WO}_3 + 3\text{H}_2 \rightarrow \text{W} + 3\text{H}_2\text{O} WO3+3H2→W+3H2OCalculate the atom economy for the production of tungsten in this reaction.
Give your answer to three significant figures.
(Relative formula masses: WO3=232\text{WO}_3 = 232WO3=232, H2=2\text{H}_2 = 2H2=2, W=184\text{W} = 184W=184, H2O=18\text{H}_2\text{O} = 18H2O=18)
Practise Edexcel GCSE Chemistry Quantitative analysis with exam-style questions for Foundation and Higher tier. 119 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.
