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Challenging stoichiometery question?

An element X forms an iodide (XI3) and a chloride (XCl3) The Iodide is quantitatively converted to the chloride when it is heated in a steam of chlorine.

2XI3+3Cl2-------2XCl3+3I2 I is the iodide X is the unknown substance Cl is chlorine

If 0.5000g of XI3 is treated, 0.2360g of XCl3 is obtained.

A. Calculate the atomic weight of the element X

B. Identify element X

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