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    hslove142331's Avatar
    hslove142331 Posts: 71, Reputation: 1
    Junior Member
    		  
    #1

    Feb 6, 2010, 12:09 AM
    Calculate heat of vaporization
    A compound has a vapor pressure of 405 mm Hg at 249 Celsius. This compound boils at 281 celsius at the sea level. Calculate its heat of vaporization.

    How can I find this?
    Do you know any formula that find this problem?
    Thanks..

    Also, butane and methanol, butane is lower boiling point than methanol , right?
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Feb 6, 2010, 12:37 AM

    You know that a liquid boils when it's vapour pressure is equal to the ambient pressure.

    I think the formula to be used it this:

    Clausius?Clapeyron relation - Wikipedia, the free encyclopedia



    P1 and T1 are the pressure and temperature for the liquid in situation 1
    P2 and T2 are those for the liquid at situation 2
    Delta H vap is what you're looking for.
    R is the gas constant, being 8.31 J/(mol K)

    Make the necessary conversions of units, solve for Delta H vaporisation.
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