- #1
ravadongon
- 10
- 0
Question 1: 5L of nitrogen at 100kPa and 298K and 5L of oxygen at 200kPa are pumped into a evacuated 50L cylinder. Temperature remains constant, what is the total pressure in the cylinder?
Correct Answer: 30kPa
My answer: 300 kPa
Question 2: A 10L flask containing nitrogen at 500mmHg is connected via a closed tap to a 4L flask containing oxygen at 800mmHg pressure, if the tap is opened what will be the final pressure assuming temperature remains constant?
Answer: 586mmHg
My answer: 1300mmHg
Formulas I used:
pV = nRT (to find mols)
PA = (nA/nA+nB) x PT
How did they get these answers...cos I can't seem to get them..?? Any help would be appreciated...
Correct Answer: 30kPa
My answer: 300 kPa
Question 2: A 10L flask containing nitrogen at 500mmHg is connected via a closed tap to a 4L flask containing oxygen at 800mmHg pressure, if the tap is opened what will be the final pressure assuming temperature remains constant?
Answer: 586mmHg
My answer: 1300mmHg
Formulas I used:
pV = nRT (to find mols)
PA = (nA/nA+nB) x PT
How did they get these answers...cos I can't seem to get them..?? Any help would be appreciated...