1.40gO2 × 1molO2 /32.00gO2 = 0.0438mol O2 1.84gN2 × 1molN2 / 28.02gN2 = 0.0657molN2 The total number of moles of gas is 0.0438molO2 +0.0657molN2 = 0.1094mol At STP, 0.1094mol × 22.4L / 1mol = 2.45L I'm confused how 22.4L is there in the equation. Also why does oxygen O2 and nitrogen N2 have two atom. Is it because it's a gases so it's O2 and N2 instead of being O and N?

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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.