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Physical Chemistry Help

  • 01-02-2008 7:23pm
    #1
    IrishKnight
    Registered Users, Registered Users 2 Posts: 922 ✭✭✭


    I need some help with my physical chemistry work. I have the following two queations which I can not answer nor even know where to start.

    (a) A 10.0 g sample of a substance was heated in a 2.00 x 10-3 m3 (2.00 L)
    bulb and heated until it completely vaporized. The temperature and pressure of the vaporized sample were 343 K and 100 kPa. Assuming ideal gas behaviour, calculate the molecular weight of the substance.

    (b)If the sample was expanded, at 343 K, to a pressure of 30 kPa, what would the volume of the sample be?

    (c)If the sample was heated to 400 K, what would the pressure be?

    (d)How much energy was used to heat the sample from 343 to 400 K?

    (e)What is the average speed of the gas molecules in the sample at 400 K?

    How it is the last two question which I can not get.

    The following are the answers which I got for a to c

    (a) 142.85 mol g^-1
    (b) 6.5x10^-3 m^3
    (c) 113,876 Pa (113 kPa)

    Would be greatful for any help.


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