8.1 Composition of air. The approximate composition of dry air by volume at 20°C is as follows: nitrogen (N₂) 78.09%, ox

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8 1 Composition Of Air The Approximate Composition Of Dry Air By Volume At 20 C Is As Follows Nitrogen N 78 09 Ox 1 (63.44 KiB) Viewed 34 times

8.1 Composition of air. The approximate composition of dry air by volume at 20°C is as follows: nitrogen (N₂) 78.09%, oxygen (O₂) 20.95%, argon (Ar) 0.93%, and CO₂ 0.03%. 446 CHAPTER 8 Chemical Sensor and Actuators a. Calculate its composition by mass. Assume air is an ideal gas at an ambient pressure of 1 atm (101,325 Pa) and temperature of 20°C. b. Calculate the composition of air in mol/m³. The air density at 20°C and an ambient pressure of 1 atm is 1.2 kg/m³. c. Calculate the number of atoms (molecules in the case of CO₂) per cubic meter (m³) of air for each constituent. Note: There are many other constituents in air, but the four included here are the most important in terms of quantities.