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Homework Help: Chemistry: Henry's law of partial pressure of gas.

  1. Jul 17, 2007 #1
    1. The problem statement, all variables and given/known data
    This is not a textbook question.
    Henry's Law states that:
    where p=pressure of gas
    x=mole fraction of gas in solution
    k= Henry's constant

    and k=p/x
    So, we can say that k tells us the pressure of gas per unit x.
    Which means k tells us the pressure of the gas when its mole fraction, x is unity.
    But what does x=1 mean, since
    x=no. of moles of solute/(no. of moles of solute + no. of moles of solvent)

    if x=1
    then this means: moles(solute)>>moles(solvent)
    Am I wrong?

    The value of k for helium dissolved in water is 144.97
    What does it mean?

    Please explain...

    Mr V
    Last edited: Jul 17, 2007
  2. jcsd
  3. Jul 18, 2007 #2
    When x=1, it means that only that substance is present. I.e., its a pure substance. Hence, when only that gas is present, k is its pressure at that temperature/volume/per mole.
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