def _d_g(d_h: float, d_s: float, temp: float) ->float:
    """Find the free energy given delta h, s and temp

    Args:
        d_h: The enthalpy increment in kcal / mol
        d_s: The entropy increment in cal / mol
        temp: The temperature in Kelvin

    Returns:
        The free energy increment in kcal / (mol x K)
    """
    return d_h - temp * (d_s / 1000.0)
