# science

posted by .

15. Two 5 dm3 flasks are connected by by a narrow tube of negligible volume. Initially the two flasks are both at 27 oC and contain a total of 2 moles of an ideal gas. One flask is heated to a uniform temperature of 127 oC while the other is kept at 27 oC. Assuming their volume does not alter, calculate the number of moles of gas in each flask of the gas and the final pressure.

• science -

Two 5 dm3 flasks are connected by a narrow tube of negligible volume. Initially the two flasks are both at 27oC and contain a total of 2 moles of an ideal gas. One flask is heated to a uniform temperature of 127oC while the other is kept at 27oC. Assuming their volume does not alter, calculate the number of moles of gas in each flask of the gas and the final pressure.
Solution: As their volumes are kept constant, P then varies directly with T. A number of 1 mole (= 2/1) of gas is comprehensively distributed within each flask.
In the initial condition on ideal gas, PV = nRT or P x (2x5) = 2 x 0.082 x (273+27) => P equals 4.92 atm as an initial one.
Anyway, as the flask of our consideration is heated to the temperature of 127 degree Celcius, a number of total moles are kept constant at 2 moles, but leaking from the flask of our consideration to the other one, for example X mol, leaving the flask 1 - X mole, and the other one 1 + X mol.
=> P’x V = (1 - X) x R x (273+127)
Likewise, tempt-controlling flask: P’V = nRT
=> P’ x V = (1 + X) x R x (273+27)
Then, X = 0.143 mol. That is, heated flask will contain gas of 1 - 0.143 = 0.857 mol and the other one 1.143 mol.
Considering the heated flask, PV = nRT => P x 5 = 0.857 x 0.082 x (273+127) = 5.62 atm as a final pressure gauged. We can check for the correctness by considering the other flask; PV = nRT => P x 5 = 1.143 x 0.082 x (273+27) = 5.62 atm.

## Similar Questions

1. ### Chemistry

Two flasks containing the same inert gas are at the same temperature and pressure of 800. mm Hg. One flask is injected into each of the flasks to allow phase equilibrium to be established. No leakage occurs. If the pressure in the …
2. ### Chemistry

Two Flasks containing the same inert gas are at the same temperature and pressure of 800 mmHg. One flask has volume of 1.0 L and the other, a volume of 2.0 L. Enough volatile liquid is injected into each of the flasks to allow phase …
3. ### Chemistry

A 260-ml flask contains pure helium at a pressure of 756torr . A second flask with a volume of 470ml contains pure argon at a pressure of 717 torr . A)If the two flasks are connected through a stopcock and the stopcock is opened, what …
4. ### chemistry 105

A 260-mL flask contains pure helium at a pressure of 743 torr. A second flask with a volume of 480 mL contains pure argon at a pressure of 715 torr. If the two flasks are connected through a stopcock and the stopcock is opened, what …
5. ### college chemistry 4

you and a friend have two flasks, one containing hydrogen gas and the other chlorine gas; you each take one flask and go to opposite sides of the room, 10.0m apart. if you were both to popen your flasks toward each other at the same …
6. ### Chemistry

If there are 2L of H2 gas at .625 atm, and 1L of N2 gas at .200 atm isolated in two flasks, what are the final partial pressures of each, and the total pressure, after the valve between the two flasks has been opened and the gases …
7. ### chemistry

nitrogen gas reacts with hydrogen gas to form ammonia. The nitrogen gas is in a closed 500.0 mL flask at 751 mm HG connected to a 1.25 L flask containing the hydrogen gas at 1.21 atm pressure. Both flasks are kept at 37C. if the stopcock …
8. ### Chemistry

Two separate flasks are each filled with a gas at 25.0°C; the valve between them is opened and the gases are allowed to mix. What would be the final pressure in torr after mixing, if initially H2 is in the first flask (Volume = 4.000 …
9. ### Science "HELP"!

1.)A vacuum flask keeps its contents warmer or cooler than the surrounding environment for a length of time. It consists of two flasks, one inside the other, that connect at the neck. The space between the two flasks is COMPLETELY …
10. ### Chemistry

Consider two flasks. What are the final partial pressure of H2 and N2 after the stopcock between the two flasks is opened?

More Similar Questions