College-CHEM 4- Summer18-HAN Activities and Due Dates HW 15 8/4/2018 11:55 PM 8.
ID: 637379 • Letter: C
Question
College-CHEM 4- Summer18-HAN Activities and Due Dates HW 15 8/4/2018 11:55 PM 8.5/10 8/4/2018 05:37 AM Print ll Calculator Periodic Table Question 5 of 28 Map Sapling Learning A sample of nitrogen gas was collected via water displacement. Since the nitrogen was collected via water displacement, the sample is saturated with water vapor. If the total pressure of the mixture at 21 C is 1.79 atm, what is the partial pressure of nitrogen? The vapor pressure of water at 21 "C is 18.7 mm Hg. Number atm Hint O Previous ® Give Up & View Solution Check Answer 0 Next ?? Ext about uns careers privacy policy terms of use contactus heExplanation / Answer
When a gas is collected by displacement of water some of the water escapes as water vapour and hence additional pressure is created because of this.(this is because as the amount of gases increases in same volume pressure increases.)
the total pressure=pressure due to gas+pressure due to saturated vapour
1atm=760 mm of Hg
water vapour pressure=18.7 mm of Hg=18.7/760 atm=0.02368 atm
pressure of gas=total pressure-water vapour pressure=1.79-0.02368 atm=1.7663 atm