A compound formula XCl3 reacts with aqueous AgNO3 to yield solid AgCl according to the subsequent equation
XCl3(aq)+3AgNO3(aq)?X(NO3)3(aq)+3AgCl(s)
Explain when a solution containing 0.521g of XCl3 was allowed to react with an excess of aqueous AgNO3, 1.68 g of solid AgCl was formed.
Explain what is the identity of the atom X?