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2.00 L of air at standard temperature and pressure is sampled and analyzed for NO 2 (g). The sample is found to contain 56.4 mg

2.00 L of air at standard temperature and pressure is sampled and analyzed for NO2(g). The sample is found to contain 56.4 mg of NO2.

What is the concentration, in ppm, of NO2 in the air? (Assume density of air at STP is 1.225 kg/m3)

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