An oxygen tank kept at 20 ◦C contains 28 moles of oxygen and the gauge reads 31 atm. After two weeks, the gauge reads 10.5 atm. How much oxygen was used during the twoweek period? 1. 9.48 mol 2. 9.25 mol 3. 20.5 mol 4. 18.52 mol 5. 7.51 mol

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