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A mixture of oxygen and helium is 92.3% by mass oxygen. It is collected at atmospheric pressure (687 torr). What is the partial pressure of oxygen in this mixture?
1. 446 Torr
2. 414 Torr
3. 688 Torr
4. 299 Torr
5. 333 Torr
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Based on our data, we think this problem is relevant for Professor Sparks' class at TEXAS.