Lecture_Notes_092809a

Lecture_Notes_092809a - Collecting a gas over water...

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Limiting Reactant in Solution y What mass of solid aluminum hydroxide can be produced when 50.0 mL of 0.200 M Al(NO 3 ) 3 is added to 200.0 mL of 0.100 M KOH? What are the concentrations of all the ions remaining in solution after precipitation has occurred?

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Limiting Reactant in Solution
Air Bags y What would be the volume at STP when an airbag with 100 g of NaN 3 inflates?

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What will happen to the Peeps? Get b i gg e r Ge t s m aller Sta y th ame 50% 3% 48% 1. Get bigger 2. Get smaller 3. Stay the same
A mixture of gases contains 2.0 mol He, 3.0 mol Ne and 1.0 mol Ar, with a total pressure of 8.0 atm. What is the partial pressure of He? 4.0 at m 2.7 atm 1 . 3 a tm 8 .0 12% 4% 20% 64% 1. 4.0 atm 2. 2.7 atm 3. 1.3 atm 4. 8.0 atm

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Practice Problem y A container of unknown volume contains He at 25 o C and 1.960 atm. When a portion of the He is withdrawn and adjusted to 1.00 atm, it is found to have a volume of 1.75 mL. The gas remaining in the first container now has a pressure of 1.710 atm. Determine the volume of the container.

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Unformatted text preview: Collecting a gas over water Collecting a gas over water y A sample of solid potassium chlorate was heated in a test tube and decomposed by the reaction that follows. The oxygen was collected by displacement of water at 22 o C at a total pressure of 754 torr. The volume of the gas collected was 0.650 L, and the vapor pressure of water at 22 o C is 21 torr. Calculate the mass of KClO 3 in the sample that decomposed. { KClO 3 (s) Æ KCl (s) + O 2 (g) Kinetic Molecular Theory y 1. Molecules are small and occupy little space in a gas. Therefore we assume they are only dimensionless points. Kinetic Molecular Theory y 2. Molecules move very rapidly in a gas and exert a force on the walls. Kinetic Molecular Theory y 3. Molecules have no forces between them. When they collide they undergo elastic collisions: the molecules do not absorb any energy....
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Lecture_Notes_092809a - Collecting a gas over water...

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