2 When zinc metal is added to hydrochloric acid, the following reaction takes place Zn(s) + 2 HCl(aq) → ZnCl₂(aq) + H₂(g) Calculate the volume of H₂ gas collected over water at 30.0 °C when 72.9 g of zinc is added to excess hydrochloric acid if the total pressure is 695 torr. The vapor pressure of water at 30.0 °C is 31.8 torr.

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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.