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A sealed iron vessel holds four gases: 2.25 mol ammonia, 1.25 mol argon, 0.5 mol oxygen,...

A sealed iron vessel holds four gases: 2.25 mol ammonia, 1.25 mol argon, 0.5 mol oxygen, and 2 mol nitrogen. If the partial pressure of N2 is 300 mmHg, what is the total pressure in the vessel?  

A. 450 mmHg  

B. 900 mmHg  

C. 1800 mmHg  

D. 3600 mmHg  

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