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Ch.3 - Mass Relationships in Chemical Reactions

Chapter 3, Problem 118

Element X, a member of group 5A, forms two chlorides, XCl3 and XCl5. Reaction of an excess of Cl2 with 8.729 g of XCl3 yields 13.233 g of XCl5. What is the atomic weight and the identity of the element X?

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