The concentration of carbon monoxide in a sample of air is 8.1 × 10-6.There are ________ molecules of CO in 1.00 L of this air at 755 torr and 23°C.
A) 3.3 × 
B) 2.0 × 
C) 2.6 × 
D) 1.5 × 
E) 2.0 × 
Correct Answer:
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