posted by May on .
1)A sample of propane gas occupies 625 cm3 at 20.0 °C and 750 torr. What is the final volume in cubic centimeters at -80.0 °C and 750 torr?
2)If oxygen gas is collected over water at 25 °C and 775 torr, what is the partial pressure of the O2? The vapor pressure of water at 25 °C is 23.8 torr.
1. (P1V1/T1) = (P2V2/T2)
Remember T must be in kelvin.
2. Ptotal = pO2 + pH2O
Substitute and solve for pO2.
and 775 torr?
I didn't work 1 but 2 can't be right. 775 is Ptotal so how can it be pO2?
No, 519 cc isn't correct either. Post your work and I'll find the error.
Your set up is right (except for calling torr psi). So your error must be in the math part.