Lec-25-Chap-10-2

# Lec-25-Chap-10-2 - CHE 131 Review Lecture 25 Gas density...

This preview shows pages 1–3. Sign up to view the full content.

CHE 131 Lecture 25 – Gas density, partial pressures, real gases Chapter 10: pp. 457-467. p.458 Review: Does volume of balloon increase or decrease as it ascends into the troposphere? Example: What volume will 24.0 g O 2 (MM 32.0) occupy at 25 ° C and a pressure of 0.888 atm ? ( 24.0 g )(1 mol) n = = 0.750 mol (32.0 g) V =?; P = 0.880 atm ; T = ( 25 + 273)K = 298K V = nRT/P = ( 0.750 mol )(0.08206L × atm/mol × K)( 298K ) 0.888atm = 20.7 L Example: A student generates oxygen gas and collects it over water . If the volume of the gas is 245 mL and the barometric pressure is 756 torr at 25 o C, what is the volume of the “dry” oxygen gas at STP? ( P water = 23.8 torr at 25 o C ) P O2 = P bar - P water = ( 756 - 23.8 ) torr = 732 torr

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

View Full Document
Example: A student generates oxygen gas and collects it over water . If the volume of the gas is 245 mL and the barometric pressure is 756 torr at 25 o C , what is the volume of the “dry” oxygen gas at STP? P water = 23.8 torr at 25 o C ; P O2 = P bar - P water = ( 756 - 23.8 ) torr = 732 torr P 1 = P O2 = 734 torr ; P 2 = SP = 760. torr V 1 = 245mL; T 1 = 298K; T 2 = ST = 273K ; V 2 = ?
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 6

Lec-25-Chap-10-2 - CHE 131 Review Lecture 25 Gas density...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online