A 0.865 g sample of an unknown metal (X) reacted with hydrochloric acid according to the balanced equation shown below. X(s) + 2 HCl(aq) --------- XCl2(aq) + H2(g) The volume of the hydrogen gas collected over water was measured at 191mL at 22oC and an atmospheric pressure of 762 mmHg. Calculate the molar mass of the unknown metal, and use the periodic table to identify the metal.

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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.