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  1. #1
    nickname
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    combined gas law?

    what do i do after i plug in all the variables?

    80mL sample of flourine gas at 0 degree celcius has a pressure of 761 torr. what is its volume at 100 degree C and 761 torr?

    P1 = 761 torr
    V1 = 80 ml
    T1 = 0 C = 0 + 273.15 = 273
    P2 = 761 torr
    T2 = 0 + 273.15 = 373.15 K
    V2 = ?
    761 torr)(80mL) = (761 torr)(V2)
    (273 K) ......................... (373 K)

    do i cross multiply or what? i dont get it

  2. #2
    RONALD E B
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    P1V1/T1 = P2V2/T2
    You want to solve for V2, so isolate it on one side
    Divide both sides by P2 and multiply both sides by T2

    P1V1T2/(T1P2) = P2V2T2/(T2P2) = V2

    (This is basic algebra; chemistry uses basic algebra in many problems)

  3. #3
    Norrie
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    As pressure is constant, it is not required for the calculation.
    Use Charles' Law.
    V1 x T2 = V2 x T1.

    V1 = 80mL; V2 = ?.
    T1 = 273K; T2 = 373K.

    80mL x 373K = V2 x 273K.
    V2 = 29,840 / 273 = 109.3mL Final volume.

    (Check: by proportion. (373K / 273K) x 80mL = 109.3mL).

 

 

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