Chemistry

Help please?
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.

asked by May
  1. 1. (P1V1/T1) = (P2V2/T2)
    Remember T must be in kelvin.

    2. Ptotal = pO2 + pH2O
    Substitute and solve for pO2.

    posted by DrBob222
  2. 519 cm3
    and 775 torr?

    posted by May
  3. I didn't work 1 but 2 can't be right. 775 is Ptotal so how can it be pO2?

    posted by DrBob222
  4. No, 519 cc isn't correct either. Post your work and I'll find the error.

    posted by DrBob222
  5. 1)(750psi)(625cm3)/293k=(v)(750psi)/193k

    posted by May
  6. Your set up is right (except for calling torr psi). So your error must be in the math part.

    posted by DrBob222

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