Metal X\text{X}X is extracted from its chloride, XCl4\text{XCl}_4XCl4, by reaction with magnesium.
The equation for the reaction is:
XCl4+2Mg→X+2MgCl2\text{XCl}_4 + 2\text{Mg} \rightarrow \text{X} + 2\text{MgCl}_2XCl4+2Mg→X+2MgCl2
The percentage atom economy for obtaining metal X\text{X}X by this method is 20.1%20.1\%20.1%.
Calculate the relative atomic mass (ArA_{\text{r}}Ar) of metal X\text{X}X. Give your answer to 1 decimal place.
Relative atomic masses (ArA_{\text{r}}Ar): Mg=24.3\text{Mg} = 24.3Mg=24.3, Cl=35.5\text{Cl} = 35.5Cl=35.5