Water Vapor Magnesium metal is reacted with hydrochloric acid to produce hydrogen gas. A sample of hydrogen gas is collected over water in a eudiometer. Calculate the mass (in grams) of magnesium metal needed to produce 27.0 mL of hydrogen gas at an atmospheric pressure of 739 mmHg and a temperature of 25.9° Temperature °C Pressure (mmHg) 20 17.5 C. 22 19.8 24 22.4 Mass of Mg = %3D 26 25.2 28 28.3 30 31.8

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Q: pressure

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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.