Density: Under standard conditions, the density of air is 1.29 kg/m3. What is the mass of the air inside a room measuring 4.0 m × 3.0 m × 2.0 m?
A. 0.32 kg
B. 3.1 kg
C. 31 kg
D. 1.9 kg
E. 19 kg
Answer: C
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