A sample of hydrogen gas was collected over water at 21.0°C and at a pressure equal to the atmospheric pressure of 748 torr. The volume of the sample was 512 mL. How many grams of H2 are in the sample? (The vapor pressure of water at 21.0°C is 18.7 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.