When chromium metal is added to nitric acid, the following reaction takes place Cr (s) + 6 HNO3 (aq) → Cr(NO3)3 (aq) + 3 H2O (1) + 3 NO2 (g) Calculate the volume of NO2 gas (in L) collected over water at 40.0 °C when 25.9 g of chromium is added to excess nitric atid if the total pressure is 675.0 torr. The vapor pressure of water at 40.0 °C is 55.3 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.