A gas mixture with a total pressure of 745 mmHg contains eachof these gases at the indicated partial pressures: CO2, 125 mmHg;Ar, 214 mmHg; and O2, 187 mmHg. The mixture also containshelium gas. What is the partial pressure of the helium gas? Whatmass of helium gas is present in a 12.0-L sample of this mixtureat 273 K?

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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.