. What volume of hydrogen gas at 27°C and 723 torr may be prepared by the reaction of 4.54 g of gallium with an excess of hydrochloric acid? The unbalanced equation is shown below. Ga (s) + HC (ag) — GaCl3 (аq) + Hг (g)

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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.