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    mstehman88's Avatar
    mstehman88 Posts: 3, Reputation: 1
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    #1

    May 12, 2009, 02:16 PM
    2 equations used for calculating number of moles from a slope. What r the variables?
    I was given 2 equations to use for my hw.

    Im suppose to use the slope to calculate the number of moles.

    What do the variables R T and P stand for?

    N = Moles I don't know what the others stand for though.

    And help would be great.
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    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #2

    May 12, 2009, 02:31 PM

    this is just a derivation from the ideal gas formula: PV=nRT, where P is the pressure in Pa, V is the volume in m^3, n is the number of moles, R is the molar gas constant in J .K^-1.mol^-1, and T is the temperature in K.

    without knowing what the axes are on your graph, and thus what the slope you're measuring is, I can't really help you further.
    mstehman88's Avatar
    mstehman88 Posts: 3, Reputation: 1
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    #3

    May 12, 2009, 06:07 PM
    Part 1 Is Volume vs Temp. The slope is 2.616 E-007 Temp is X and Volume is Y

    Please let me know if this helps to continue the problem
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    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #4

    May 13, 2009, 12:59 AM

    So replacing slope with V/T, we get n=PV/RT, rearraging we get back to PV=nRT.

    I guess in your experiment you were keeping pressure constant? Just plug in the values for P and R.
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