Question

6. Two flasks at the same temperature are joined by a glass tube with a stopcock. Flask A is a 4.0 L flask containing
N2(e) at 2.0 atm, while flask B is a 10.0 L flask containing CO(g) at 1.4 atm. What is the final pressure in the flasks
after the stopcock is opened?
Hints:
Determine the final volume for the gases leasy!).
.

Answer 1

The final pressure in the flasks (containing N₂ and CO) after the stopcock is opened is 1.57 atm

How to determine the mole in flask A

• Volume (V) = 4 L
• Pressure (P) = 2 atm
• Temperature (T) = STP = 273 K
• Gas constant (R) = 0.0821 atm.L/Kmol

• Number of mole (n) =?

n = PV / RT

n = (2 × 4) / (0.0821 × 273)

n = 0.357 mole

How to determine the mole in flask B

• Volume (V) = 10 L
• Pressure (P) = 1.4 atm
• Temperature (T) = STP = 273 K
• Gas constant (R) = 0.0821 atm.L/Kmol

• Number of mole (n) =?

n = PV / RT

n = (1.4 × 10) / (0.0821 × 273)

n = 0.625 mole

How to determine the final pressure

• Total volume (V) = 4 + 10 = 14 L
• Total mole (n) = 0.357 + 0.625 = 0.982 mole
• Temperature (T) = STP = 273 K
• Gas constant (R) = 0.0821 atm.L/Kmol

• Pressure (P) =?

P = nRT / V

P = (0.982 × 0.0821 × 273) / 14

P = 1.57 atm

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