Ch 5_slides with handwritten notes_021312

# Ch 5_slides with handwritten notes_021312 - volume of the...

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What if you forget Boyle’s Law? A gas sample at a pressure of 1.23 atm has a volume of 15.8 cm 3 , what will be the volume (in L) if the pressure is increased to 3.16 atm?

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Example of Avogadro’s Law If the volume of 2.67 g of SF 6 gas at 1.143 atm and 28.5°C is 2.93 m 3 , what mass of SF 6 will you find in a container with a volume of 543.9 m 3 at the same pressure and temperature?
Example of Amontons’ Law The air pressure in the tires of an automobile is adjusted to 28 psi at a gas station in San Diego, CA, where the air temperature is 68 o F (20. o C). The automobile is then driven east along a hot desert highway. Along the way, the temperature of the tire reaches 140 o F (60. o C). What is the pressure in the tires?

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Another Boyle’s Law Example An inflated balloon has a volume of 0.55 L at sea level. It is allowed to rise to a height of 6.5 km, where the pressure is about 0.40 atm. Assuming the temperature remains constant, what is the final

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Unformatted text preview: volume of the balloon? ANS: 1.4 L Another Charles’ Law Example A 452-mL sample of fluorine gas is heated from 22 o C to 187 o C at constant pressure. What is the final volume of the gas? ANS: 705 mL Effusion (cont.) • Effusion is dependent on molecular speed. The molecular speed is in turn inversely dependent on the atomic or molar mass. Recall: • Graham’s Law of Effusion: Rates of effusion are inversely dependent on the square root of the mass of each gas: 3 rms RT u M 2 1 1 2 Rate of effusion Rate of effusion M M Diffusion Reactions • By similar arguments, the distance a molecule travels is inversely proportional to mass: • Example from text: reaction of NH 3 with HCl 2 1 1 2 distance distance M M Actual : 1.3 (?°?±²³´?) µ¶ 3 (?°?±²³´?) ¶·¸ = ¹ ¶·¸ ¹ µ¶ 3 = º6.5 17 = 1.5 (Theoretical)...
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## This note was uploaded on 02/22/2012 for the course CHEM 142 taught by Professor Zoller,williamh during the Winter '07 term at University of Washington.

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Ch 5_slides with handwritten notes_021312 - volume of the...

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