A student reads a barometer in the laboratory and finds the prevailing atmospheric pressure to be 750 mm Hg. Express this pressure in atmospheres, kilopascals, torrs, pounds per square inch, and pascals. Hint:   1 atm   =  101.3 kPa   =  760 torr   =  760 mm Hg   =  14.69 psi   =   1.013×105 Pa

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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.