7a.  A steel cylinder contains a mixture of nitrogen, oxygen, and carbon dioxide gases.  The total pressure of the tank is 2100 mm Hg.  The pressure exerted by the nitrogen and oxygen is 810 and 920 mm Hg respectively.  What is the pressure in atmospheres (atm) of the carbon dioxide gas in the mixture?

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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.