Asked by Sarah Pick

A flask of unknown volume was filled with air at a pressure of 389.0 kPa. The flask was attached to an evacuated flask of 32.0 L and the air was allowed to expand into the second flask. At equilibrium, the final pressure was 154.0 kPa. Calculate the volume of the unknown flask.
Answered by Sarah Pick

(a) Use Boyle's law to calculate the volume the gas will occupy if the pressure is increased to 1.79 atm while the temperature is held constant.


3.17 L

(b) Use Charles's law to calculate the volume the gas will occupy if the temperature is increased to 175°C while the pressure is held
Answered by DrBob222
Intuitively you see that the pressure has decreased which means the volume must have increased; therefore, the volume of the old flask is v and the volume of the combined flasks is 32+v
Since p1v1 = p2v2, then
389*v = 154(32+v) and solve for v.
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