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A 25 × 10 –3 m 3 volume cylinder is filled with 1 mol of O 2 gas at room temperature (300 K). The molecular diameter of O 2 , and its root mean square speed, are found to be 0.3 nm and 200 m/s, respectively. What is the average collision rate (per second) for an O 2 molecule ?

1. ~10 12
2. ~10 10
3. ~10 13
4. ~10 11

Correct answer: ~10 12

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