Chemistry

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If argon has a volume of 5.0 dm3 and the pressure is .92 atm and the final temperature is 30 degrees celcius and the final volume is 5.7 L and the final pressure is 800 mm Hg, what was the initial temperature of the argon?

  • Chemistry -

    (P1V1/T1) = (P2V2/T2)
    Remember T must be in kelvin.

  • Chemistry -

    5.0 dm^3= 5 Liters

    (P1V1/T1)=(P2V2/T2)

    P1= .92 atm
    V1= 5.0 L
    T1=?

    P2= (800 mmHg/760 mmHg)= 1.05 atm (There are 760 mmHg in 1 atmosphere)
    V2= 5.7 L
    T2= 30 degrees Celsius

    ((.92 atm)*(5.0 L))/(T1)=((1.05 atm)*(5.7 L))/(30 Degrees)

    4.6/T1= .1995

    4.16/.1995= T1
    T1= 20.8 Degrees Celsius

  • Chemistry -

    @DrBob222- Temperature does not need to be in Kelvin because it is a ratio, converting to Celsius would give her the same answer.

  • To Matt--Chemistry -

    I beg your pardon. My calculations show two things.
    a. your math is not right.
    b. your chemistry is way not right.
    The ratio of T is NOT the same and T is not the same.
    Your method.
    (0.92*5/T1) = (1.05*5.7/30)
    T1 = (0.92*5*30)/(1.05*5.7)] = 23.06 which I would round to 23.1. I assume degrees C. But this is incorrect.

    The correct method.
    4.6/T1 = (5.7*1.05/303) = 0.01975
    T1 = 0.01975/4.6 = 232.88 K which is 232.88-273.15 = -40.26 C.
    BIG DIFFERENCE.
    Temperature MUST be in kelvin.

  • Chemistry -

    how do i find out what the normal boiling point of a liquid could be if the vapor pressure of the liquid is .92 atm at 60 degrees celsius?

  • Chemistry -

    Chode

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