Hydrogen gas is produced by the reaction of hydrochloric acid, HCl, on zinc metal. 2HCl(aq) + Zn(s) → ZnCl₂(aq) + H₂(g) The gas is collected over water. If 152 mL of gas is collected at 19°C and 768 torr total pressure, what is the mass of hydrogen collected? The vapor pressure of water at 19°C is 16.5 torr. HOW DO WE GET THERE? What is the partial pressure of hydrogen present? (The vapor pressure of water at 19°C is 16.5 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.