def SMK(T, Tc, omega):
omegaR1, omegaR2 = <NUM_LIT>, <NUM_LIT><EOL>A10 = <NUM_LIT><EOL>A20 = -<NUM_LIT><EOL>A30 = -<NUM_LIT><EOL>B10 = <NUM_LIT><EOL>B20 = <NUM_LIT><EOL>B30 = -<NUM_LIT><EOL>A11 = -<NUM_LIT><EOL>A21 = -<NUM_LIT><EOL>A31 = -<NUM_LIT><EOL>B11 = <NUM_LIT><EOL>B21 = <NUM_LIT><EOL>B31 = -<NUM_LIT><EOL>tau = <NUM_LIT:1.> - T/Tc<EOL>L0 = A10*tau**(<NUM_LIT:1>/<NUM_LIT>) + A20*tau**(<NUM_LIT:5>/<NUM_LIT>) + A30*tau**(<NUM_LIT:1>-<NUM_LIT:1>/<NUM_LIT> + <NUM_LIT:1>/<NUM_LIT>) +B10*tau + B20*tau**<NUM_LIT:2> + B30*tau**<NUM_LIT:3><EOL>L1 = A11*tau**(<NUM_LIT:1>/<NUM_LIT>) + A21*tau**(<NUM_LIT:5>/<NUM_LIT>) + A31*tau**(<NUM_LIT:1>-<NUM_LIT:1>/<NUM_LIT> + <NUM_LIT:1>/<NUM_LIT>) +B11*tau + B21*tau**<NUM_LIT:2> + B31*tau**<NUM_LIT:3><EOL>domega = (omega - omegaR1)/(omegaR2 - omegaR1)<EOL>return R*Tc*(L0 + domega*L1)<EOL>
r'''Calculates enthalpy of vaporization at arbitrary temperatures using a
    the work of [1]_; requires a chemical's critical temperature and
    acentric factor.

    The enthalpy of vaporization is given by:

    .. math::
         \frac{\Delta H_{vap}} {RT_c} =
         \left( \frac{\Delta H_{vap}} {RT_c} \right)^{(R1)} + \left(
         \frac{\omega - \omega^{(R1)}} {\omega^{(R2)} - \omega^{(R1)}} \right)
         \left[\left( \frac{\Delta H_{vap}} {RT_c} \right)^{(R2)} - \left(
         \frac{\Delta H_{vap}} {RT_c} \right)^{(R1)} \right]

        \left( \frac{\Delta H_{vap}} {RT_c} \right)^{(R1)}
        = 6.537 \tau^{1/3} - 2.467 \tau^{5/6} - 77.251 \tau^{1.208} +
        59.634 \tau + 36.009 \tau^2 - 14.606 \tau^3

        \left( \frac{\Delta H_{vap}} {RT_c} \right)^{(R2)} - \left(
        \frac{\Delta H_{vap}} {RT_c} \right)^{(R1)}=-0.133 \tau^{1/3} - 28.215
        \tau^{5/6} - 82.958 \tau^{1.208} + 99.00 \tau  + 19.105 \tau^2 -2.796 \tau^3

        \tau = 1-T/T_c

    Parameters
    ----------
    T : float
        Temperature of fluid [K]
    Tc : float
        Critical temperature of fluid [K]
    omega : float
        Acentric factor [-]

    Returns
    -------
    Hvap : float
        Enthalpy of vaporization, [J/mol]

    Notes
    -----
    The original article has been reviewed and found to have coefficients with
    slightly more precision. Additionally, the form of the equation is slightly
    different, but numerically equivalent.

    The refence fluids are:

    :math:`\omega_0` = benzene = 0.212

    :math:`\omega_1` = carbazole = 0.461

    A sample problem in the article has been verified. The numerical result
    presented by the author requires high numerical accuracy to obtain.

    Examples
    --------
    Problem in [1]_:

    >>> SMK(553.15, 751.35, 0.302)
    39866.17647797959

    References
    ----------
    .. [1] Sivaraman, Alwarappa, Joe W. Magee, and Riki Kobayashi. "Generalized
       Correlation of Latent Heats of Vaporization of Coal-Liquid Model Compounds
       between Their Freezing Points and Critical Points." Industrial &
       Engineering Chemistry Fundamentals 23, no. 1 (February 1, 1984): 97-100.
       doi:10.1021/i100013a017.