The nitrogen dioxide content of air on a particular day was 0.150 ppm by mass.
The density of the air was 1.225kgm−3.
What was the mass of nitrogen dioxide in 1m3
of air on that day?
A 1.83 × 10−7 kg
B 1.83 × 10−10 kg
C 1.84 × 10−7 kg
D 1.84 × 10−10 kg
answer is C
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- Thread Starter
A density of 1.225 kg m-3 means that a cubic metre has mass 1.225 kg.
Given that 0.150 mass units in a million are NO2, you can set up a proportion and solve for the missing term:
0.150 : 106 = x : 1.225 kg