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Answered 2008-09-02 14:47:26

Ethanol has a higher boiling point because of chemical bonding. Ethanol is an alcohol. Specifically hydrogen bonding. Ethanol is an alcohol, Butane does not have anything except Carbon and Hydrogen. I found this on Google:

Hydrogen bonding in alcohols An alcohol is an organic molecule containing an -O-H group. Any molecule which has a hydrogen atom attached directly to an oxygen or a nitrogen is capable of hydrogen bonding. Such molecules will always have higher boiling points than similarly sized molecules which don't have an -O-H or an -N-H group. The hydrogen bonding makes the molecules "stickier", and more heat is necessary to separate them. Ethanol, CH3CH2-O-H, and methoxymethane, CH3-O-CH3, both have the same molecular formula, C2H6O.

---- Note: If you haven't done any organic chemistry yet, don't worry about the names.

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They have the same number of electrons, and a similar length to the molecule. The van der Waals attractions (both dispersion forces and dipole-dipole attractions) in each will be much the same. However, ethanol has a hydrogen atom attached directly to an oxygen - and that oxygen still has exactly the same two lone pairs as in a water molecule. Hydrogen bonding can occur between ethanol molecules, although not as effectively as in water. The hydrogen bonding is limited by the fact that there is only one hydrogen in each ethanol molecule with sufficient + charge. In methoxymethane, the lone pairs on the oxygen are still there, but the hydrogens aren't sufficiently + for hydrogen bonds to form. Except in some rather unusual cases, the hydrogen atom has to be attached directly to the very electronegative element for hydrogen bonding to occur. The boiling points of ethanol and methoxymethane show the dramatic effect that the hydrogen bonding has on the stickiness of the ethanol molecules: ethanol (with hydrogen bonding) 78.5°C methoxymethane (without hydrogen bonding) -24.8°C The hydrogen bonding in the ethanol has lifted its boiling point about 100°C.

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The OH group in ethanol is highly hydrogen bonded which requires much more heat energy to break before boiling can occur. Dimethyl ether, which has the same molecular formula and molecular weight does not have this due to the ether linkage.


Ethanol is a covalent molecule with the formula, CH3CH2OH and hence it is molecular.



78.3 degrees Celsius is the boiling point of ethanol.


Ethanol is a compound. Its molecular formula is C2H5OH.


The normal boiling point of Ethanol is 78.4oC *It's 78.5oC to be precise.


no, boiling is a physical change


The pure ethanol has the boiling point 78.5 celsius while water has 100 celsius so when water is added to ethanol its boiling point becomes increased.


The boiling point of water is 100 0C at 760 mm col. Hg.The boiling point of ethanol is 78,37 0C.


Boiling point of ethanol is higher than its isomer methane due to the presence of hydrogen bond in ethanol



The boiling point of ethanol is 78.37 °C, 352 K, and 173 °F at 1 atmosphere pressure.


as vakoda is Ethanol so its molecular mas is 46.04


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Ethanol is an alcohol with the molecular formula, C2H6O and it has six hydrogen atoms.


Ethanol is a liquid at room temperature. Ethanol has a boiling point of 79 °C.


Hydrogen Bonding in ethanol but not in propane


In a single molecule of ethanol there are 2 carbon atoms as denoted in the molecular formula for ethanol C2H5OH.


The formula for ethyl alcohol, or ethanol, is C2H6O.See the Related Questions to the left to determine the molecular weight of any compound, such as ethanol.


The boiling point of methanol is lower than the boiling point of ethanol.


Ethanol has hydrogen bond where as ether does not.



The freezing point of ethanol is -114 0C. The boiling point of ethanol is 78,37 0C.


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