Warm Up 7.1 Fluorine gas @ 300K occupies a volume of 500mL. To what temperature should it be lowered to bring the volume to 300mL? A sample of hydrogen.

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Presentation transcript:

Warm Up 7.1 Fluorine gas @ 300K occupies a volume of 500mL. To what temperature should it be lowered to bring the volume to 300mL? A sample of hydrogen @ 1.5 atm had its pressure decreased to 0.50 atm producing a new volume of 750 mL. What was its orginal volume? Find the number of grams of CO2 that exert a pressure of 785 torrs @ a volume of 32.5 L & a temperature of 32C.

Warm Up 7.1- Answer Fluorine gas @ 300K occupies a volume of 500mL. To what temperature should it be lowered to bring the volume to 300mL?

Warm Up 7.1- answers 2. A sample of hydrogen @ 1.5 atm had its pressure decreased to 0.50 atm producing a new volume of 750 mL. What was its orginal volume?

Warm Up 7.1-answers 3. Find the number of grams of CO2 that exert a pressure of 785 torrs @ a volume of 32.5 L & a temperature of 32C.

Dalton’s Law Pt = P1+P2+P3+ ….. ( @ constant V & T)

Dalton’s Law-Example Air contains O2, N2, CO2, and trace amounts of other gases. What is the partial pressure of oxygen (POxygen) at sea level, if N2 and CO2 pressures are 79.10 kPa, 0.94 kPa, respectively?

Graham’s Law MM2 MM1 Rate of Diffusion/Effusion1 = Rate: speed, distance per time Hint: The lighter gas should be 1. MM2 MM1

Diffusion vs Effusion

Diffusion spreading of gas; gas particles move from areas of great concentration to areas with lower concentration until uniform.

Diffusion

Diffusion What are some examples of diffusion?

Effusion gas escapes a container through tiny holes or pores of a container.

Effusion

Effusion if hole is small enough & gas particles big enough no effusion occurs.

Effusion What are some examples of effusion?

Applying Graham’s Law Which gas effuses faster, NH3 or CCl4? How much faster does it effuse?