chemistry

A gas 'x' is collected over water at 17 degree celcius and 750 mm pressure.If the volume of the gas collected is 50 cc then calculate the volume of the dry gas at standard temperature pressure and at 17 degree celcius the vapour of pressure is 14 mm

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  1. Note the correct spelling of celsius.
    Total pressure 750 mm Hg.
    750 = Pdry gas + PH2O vapor
    750 = Pdry gas + 14
    P dry gass = ??
    Now convert to STP using (P1V1/T1) = (P2V2/T2)
    My quickie estimate is about 45 cc but that is an exact answer.

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  2. 45.58 cc

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  3. p1=total press.- p2=760mm
    vapor press. v2=?
    =(750-14)mm t2=273k
    =736mm
    v1=50cc
    t1=(17+273)k
    =290k
    USE FORMULA- p1v1/t1=p2v2/t2

    ANSWER - 45.58cc

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  4. Bro

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  5. p1 = total pressure - vapour pressure
    = 750-14 mm pressure
    = 736 mm pressure

    v1 = 50cc
    t1 = 290K

    p2 = 760 mm pressure
    t2 = 273K
    v2 = ??

    Using P1*V1/T1 = P2*V2/T2, we get
    V2 = 45.58cc (approx)

    Hope that helps!

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