Hydrogen gas is produced when magnesium metal reacts with hydrochloric acid. In the lab, a student collects 0.002823 hydrogen gas over water in a eudiometer at 23°C. The atmospheric pressure is 794 mmHg. What volume (in mL) of dry hydrogen gas would be collected? Temperature °C Water Vapor Pressure of (mmHg) 19 16.5 21 18.7 Volume of dry gas = mL 23 21.1 25 23.8 27 26.7 29 30.0

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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.