Hydrogen gas generated from the reaction of aluminum with hydrochloric acid was collected over water at 20°C. If 26.5 mL of gas was collected at an atmospheric pressure of 0.875 atm, how many mmol (millimoles) of hydrogen were collected? The vapor pressure of water at 20°C is 17.55 torr. Give your answer to 3 sig figs.   2 Al(s) + 6 HCl(aq) -> 2 AlCl3(aq) + 3 H2 (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.