CH3Cl because it is polar meaning it has both a dipole-dipole bond and dispersion bond, where as CCl4 is non polar and only has a dispersion bond. Since CH3Cl is bonded together stronger, it will be harder to break up and therefore a greater temperature will be required to boil it
Edited (9/20/10)
CCl4 has a bp 76.7 C, CH3Cl has a bp -24.2 C, see wikipedia or MSDS info.
That means the first answer is wrong.
Boiling points are based on intermolecular forces. Stronger the forces, lower the vapor pressure, higher the bp.
The reason CCl4 has a higher boiling point is because dispersion forces increase with increasing molecular weight and # of electrons. Therefore the greater number of electrons in CCl4 create a stronger dispersion force than the combined dipole+dispersion forces in the CH3Cl.
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Both are nonpolar compounds, so the difference in molar mass (more than 30% heavier) is determining the difference in boiling points.
If the impurity has a higher boiling point then the boiling point of the mixture will also be slightly higher, and vice versa.
The boiling point of water will be greatest at that point on Earth that is the closest to sea level. Boiling point of water depends on the atmospheric pressure. The boiling point of water varies depending on the weather. At low atmospheric temperatures due to weather or due to being up a mountain, the water will boil below its "normal" boiling point of 100 oC
These boiling points are:* CF4: -127,8 0C* CHF3: -82,1 0C
At sea level the boiling temperature of water is 212o Fahrenheit. At different air pressures the boiling temperature changes. Higher air pressures require higher temperatures to boil. For example, if you go to a mountain top you could lower air pressure until water could boil at say 99o Fahrenheit. If you change substances, from water to something else, that substance would have its own individual boiling temperature, the point at which it changes from liquid to gas.
as you go higher above sea level, pressure decreases. Due to the decrease in pressure, the temperature needed for water to boil is less than it is than it would be at sea level. Thus, it would take less heat energy for the bonds to break and become a gas than it would in an environment with more pressure.