The manometer on the right shows mercury (l) with a 19 cm (190  mm) difference between the gas in the manometer and the  atmosphere. If atmospheric pressure is 756 mmHg, what is the  pressure of the gas inside the manometer, in atm?

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Q: oxygen gas

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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.