Chem Lab C

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arvind_r
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Re: Chem Lab C

Post by arvind_r » September 18th, 2016, 1:19 pm

Let's start adding math/obscure concepts.
To start out simple:
A 1L flask at 400 K and 1 atm pressure of hydrogen gas is sealed to an identical empty flask so that the hydrogen can be distrubuted throughout both flasks. Then, the flasks are heated such that the temperature of the gas inside is 600K. What is the final pressure of hygrogen inside the flasks?
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Re: Chem Lab C

Post by slowpoke » September 18th, 2016, 7:39 pm

0.75 atm
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Re: Chem Lab C

Post by arvind_r » September 28th, 2016, 6:54 pm

slowpoke wrote:
0.75 atm
Correct, your turn
Chattahoochee High School Science Olympiad Co-President
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2016-17:
UGA/MIT/State/Nationals
Astro: 2/14/1/
Chem Lab: 1/-/-/
Game On: 6/-/3/
Hovercraft: -/3/-/
Dynamic Planet: 2/2/2/
Rocks & Minerals: -/14/3/

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Re: Chem Lab C

Post by kenniky » December 24th, 2016, 11:47 am

No replies for a while, so I'll just ask something lol

A 10.00 mL container of water is at 10.0◦C. A 2.23 g piece of zinc at 121 ◦C is dropped into the container. What is the resultant temperature of the system? (cZn=0.384 J/g◦C)

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Re: Chem Lab C

Post by Avogadro » February 2nd, 2017, 8:26 am

I guess I'll answer that.
12.2 °C
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Re: Chem Lab C

Post by kenniky » February 2nd, 2017, 9:11 am

Avogadro wrote:I guess I'll answer that.
12.2 °C
correct, you can ask a question now
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Re: Chem Lab C

Post by Avogadro » February 2nd, 2017, 5:20 pm

Alrighty, here's one.

5 mole samples of CO2, H2O(vapor), Ne, and CH4 are placed in separate, identical 10L cylinders at 25 °C.
a. What pressure, in mm Hg, would be generated? Assume near-ideal behavior.
b. If all of the samples were to be combined into one 20 L container, what pressure would that container be?
c. Holes are punctured in the ends of each of the identical cylinders so as to allow each of the gases to diffuse. From least to greatest, list the relative amount of time that it would take each gas to diffuse.
Lower Merion 2017
Subtitled: Revenge of the Non-Harriton

Placement Record:

Code: Islip | Conestoga | Tiger | Regionals | States
Out of: 61 | 42 | 36 | 37 | 36

Chemistry Lab: 9 | - | - | 4 | 4
Astronomy: 14 | - | 5 | 10 | 3
Material Science: 12 | 19 | 9 | 5 | 9
Optics: 14 | 7 | 3 | 4 | 2

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Re: Chem Lab C

Post by kenniky » February 3rd, 2017, 1:58 pm

Avogadro wrote:Alrighty, here's one.

5 mole samples of CO2, H2O(vapor), Ne, and CH4 are placed in separate, identical 10L cylinders at 25 °C.
a. What pressure, in mm Hg, would be generated? Assume near-ideal behavior.
b. If all of the samples were to be combined into one 20 L container, what pressure would that container be?
c. Holes are punctured in the ends of each of the identical cylinders so as to allow each of the gases to diffuse. From least to greatest, list the relative amount of time that it would take each gas to diffuse.
a. PV = nRT
P * 10L = 5 mol * 0.08206 atm L/mol K * 298 K
=> P = 12.227 atm = [b]9292 mmHg
[/b]
b. total: 20 mols
do the same thing
P =[b] 24.45 atm = 18580 mmHg[/b]

c. MM CO2 = 44, MM H2O = 18, MM Ne = 20, MM CH4 = 16
Fastest - CH4 - H2O - Ne - CO2 - Slowest
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Re: Chem Lab C

Post by Avogadro » February 3rd, 2017, 3:51 pm

kenniky wrote:
Avogadro wrote:Alrighty, here's one.

5 mole samples of CO2, H2O(vapor), Ne, and CH4 are placed in separate, identical 10L cylinders at 25 °C.
a. What pressure, in mm Hg, would be generated? Assume near-ideal behavior.
b. If all of the samples were to be combined into one 20 L container, what pressure would that container be?
c. Holes are punctured in the ends of each of the identical cylinders so as to allow each of the gases to diffuse. From least to greatest, list the relative amount of time that it would take each gas to diffuse.
a. PV = nRT
P * 10L = 5 mol * 0.08206 atm L/mol K * 298 K
=> P = 12.227 atm = [b]9292 mmHg
[/b]
b. total: 20 mols
do the same thing
P =[b] 24.45 atm = 18580 mmHg[/b]

c. MM CO2 = 44, MM H2O = 18, MM Ne = 20, MM CH4 = 16
Fastest - CH4 - H2O - Ne - CO2 - Slowest
Yup! Your turn.
Lower Merion 2017
Subtitled: Revenge of the Non-Harriton

Placement Record:

Code: Islip | Conestoga | Tiger | Regionals | States
Out of: 61 | 42 | 36 | 37 | 36

Chemistry Lab: 9 | - | - | 4 | 4
Astronomy: 14 | - | 5 | 10 | 3
Material Science: 12 | 19 | 9 | 5 | 9
Optics: 14 | 7 | 3 | 4 | 2

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Re: Chem Lab C

Post by kenniky » February 3rd, 2017, 8:34 pm

15g of CaCl2 is added to 100 mL of water. What is the resultant boiling point of the water? (assume standard conditions)
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