10_Ch10_2

# 10_Ch10_2 - In using the ideal gas law the identity of the...

This preview shows pages 1–8. Sign up to view the full content.

Mary J. Bojan Chem 110 In using the ideal gas law the identity of the gas has not been a concern . Does it work with a mixture of gases? Mix 5 moles of CO 2 V = 40L 2 moles of N 2 T = 0 ° C 1 mole of Cl 2 What is P ? 1

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Mary J. Bojan Chem 110 Partial Pressure: : the pressure a gas would have if it was the only gas in the container. Dalton ` s Law of Partial Pressures Total pressure is equal to the sum of partial pressures . The fraction of the total pressure contributed by each gas is equal to its mole fraction: Χ i " i = P i P TOT = n i n TOT 2
Mary J. Bojan Chem 110 Sample Problem 3.0L of He at 5.0 atm and 25 ° C is combined with 4.5 L of Ne at 2.0 atm and 25 ° C at constant T into a 10L vessel. What is the partial pressure of the He in the 10L vessel? 3 What is the total pressure in the 10L vessel?

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Mary J. Bojan Chem 110 Sample Problem What is the partial pressure of O 2 in the vessel? P TOT = 756 TORR GAS MOLE FRACTION T = 300.0 ° C Ar 0.320 V TOT =5.00 L N 2 0.270 CO 2 0.150 Ne 0.160 O 2 ? 1. 75.6 torr 2. 378 torr 3. 680 torr 4. 756 torr 5. There is not enough data. 4
Mary J. Bojan Chem 110 Composition of the atmosphere mole fraction: N 2 and O 2 represent > 99% of atm 5 x i = moles of i total moles

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Mary J. Bojan Chem 110 Composition of the atmosphere Eg. Neon x Ne = 0.00001818 Ne concentration = 18.18 ppm For other components use parts per million (ppm). ppm = x i × 10 6 6 If you know the barometric pressure, you can determine the partial pressure. P BAR = 0.987 atm= P TOT P Ne = x Ne P TOT = 18.18 × 10 -6 ( 0.987 atm) = 17.94 × 10 -6 atm
Chem 110 Collecting Gas over water Example: During a reaction, N 2 is collected over H 2 O. P

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 01/18/2012 for the course CHEM 110 taught by Professor Hofmann,brucerob during the Fall '08 term at Penn State.

### Page1 / 26

10_Ch10_2 - In using the ideal gas law the identity of the...

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online