Nitrogen dioxide, NO2, is a reddish-brown gas above 21.1°C and a brown liquid below 21.1°C. It is used to make nitric acid and as an oxidizer for rocket fuels. Its TLV (threshold limit value) is reached when 1.40 g of NO2 escape into a room that has a volume of 219 m3. What is the pressure in millimeters of mercury of 1.40 g of NO2 at 304 K in a 219-m3 room?

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Q: No. PdL2 (CH₂CH₂)2N

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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.