A 5 mL sample of an unknown liquid is placed into a 250 mL flask that has had all of the air removed. The pressure measured in the flask is found to be 39.9kPa. In a separate trial the student puts 214 mL of the same liquid into the same flask at the same temperature. What will the pressure measure (in kPa) in the second trial?

Question

A 5 mL sample of an unknown liquid is placed into a 250 mL flask that has had all of the air removed.  The pressure measured in the flask is found to be 39.9kPa.  In a separate trial the student puts 214 mL of the same liquid into the same flask at the same temperature.  What will the pressure measure (in kPa) in the second trial?

I did: (39.9kPa/5mL) * 214mL = 1707.72kPa 
Is this correct?

DrBob222 · Accepted Answer

In the first trial, was at least a drop of the liquid present when P was 39.9 kPa? If so then that is the vapor pressure of the liquid at that temperature and the pressure in the second trial will be 39.9 kPa.

JS · Answer

Thank you. I just asked my tutor online for help, so I do not need any help anymore. Thank you anyways! :)