What is the mass of 1.0 m3 of this air? Assume that 75% of the molecules are nitrogen (N2) and 25% are oxygen (O2).

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(a) What is the number of molecules per cubic meter in air at 20°C and at a pressure of 1.0 atm ( 1.01  105 Pa)?

(b) What is the mass of 1.0 m3 of this air? Assume that 75% of the molecules

are nitrogen (N2) and 25% are oxygen (O2).
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