2. A0.136 g sample of an unknown metal (X) reacted with excess hydrochloric acid according to the following balanced chemical reaction: 2 X(s) + 6 HC(aq) → 2 XCl(aq) + 3 H.g) The volume of hydrogen gas collected over water was 90.5 mL at 20°C and a barometric pressure of 756 mmHg. Determine the atomic mass of the unknown metal. Use the Periodic Table of clements 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.