A 40.0 g sample of potassium metal is allowed to react with excess hydrochloric acid to produce H2 gas and aqueous KCl.  The gas is collected over water at 23.0 °C in an evacuated chamber and the final volume of the chamber reached 10.3L.  What was the pressure of the DRY H2 gas that was collected in the chamber.  (HINT: The vapor pressure of water at 23.0 °C is 21.0 mmHg)

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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.