- Joined
- May 27, 2011
- Messages
- 3,486
- Reaction score
- 82
Hydrogen gas generated in a reaction is collected over water at 25 degrees Celsius and is found to have a pressure of 746 torr. The vapor pressure of water at 25 degrees Celsius is 24 torr. Which expression can be used to find the pressure of H2, in atm?
A . 24/760
B. 746/760
C. 746+24/760
D. 746-24/760
A . 24/760
B. 746/760
C. 746+24/760
D. 746-24/760
This question is from mcatquestionoftheday.com... can someone explain it? The answer is D. It seems to be an easy question. But I dont understand why they have to subtract 24 from 746 when they already gave the pressure of H2.