This question is about the extraction of metals.
Element Z is extracted from its oxide by reduction with carbon. The equation for the reaction is:
ZO+C→Z+CO \text{ZO} + \text{C} \rightarrow \text{Z} + \text{CO} ZO+C→Z+COThe sum of the relative formula masses (MrM_rMr) of the reactants (ZO+C\text{ZO} + \text{C}ZO+C) is 939393. Calculate the relative atomic mass (ArA_rAr) of Z. Relative atomic masses (ArA_rAr): C=12\text{C} = 12C=12, O=16\text{O} = 16O=16
Identify element Z using your answer to part (a) and a periodic table.
Hydrogen can be used to extract tungsten (W\text{W}W) from tungsten(VI) oxide (WO3\text{WO}_3WO3). The equation for the overall 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 percentage atom economy for extracting tungsten in this reaction. Give your answer to 2 significant figures. Relative atomic masses (ArA_rAr): H=1\text{H} = 1H=1, O=16\text{O} = 16O=16, W=184\text{W} = 184W=184