When gasses are collected by water displacement, there is always water vapor (gaseous water) present. The amount of water vapor present depends on the temperature. The greater the temperature, the more water vapor present (this quantity is called the vapor pressure). A 1.00 L volume of nitrogen gas measured at 290 K and 0.978 atm was collected at 290 K by water displacement. Use Dalton’s Law and the Ideal Gas Law to determine the number of moles of nitrogen gas that were collected. At 290 K, the vapor pressure of water is 14.59 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.