A sample of a substance with the empirical formula XCI2 weighs 0.5719 g. When it is dissolved in water and all its chlorine is converted to insoluble AgCl by addition of an excess of silver nitrate, the mass of the resulting AgCl is found to be 1.2191 g. The chemical reaction is XCI2 + 2 AgNO3—2AgCl + X(NO3)2 (a) Calculate the formula mass of XCI2. Formula mass XCI2 = g mol-1 (b) Calculate the atomic mass of X. Atomic mass X = g mol-1

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Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.