Trial #1:  A piece of magnesium with a mass of 0.330 grams was placed into a solution of hydrochloric acid.  335 mL of hydrogen gas were produce when this reaction occurred at 22.0 °C and a pressure of 747 mmHg.   Mg(s) + 2HCl(aq) ⟶⟶  H2(g) + MgCl2(aq)

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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.