The estimated average concentration of NO2 in air in theUnited States in 2006 was 0.016 ppm. (a) Calculate thepartial pressure of the NO2 in a sample of this air whenthe atmospheric pressure is 755 torr (99.1 kPa). (b) Howmany molecules of NO2 are present under these conditionsat 20 °C in a room that measures 15 x 14 x8 ft?

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