![]() Well, the opposite of vaporization, of course. ![]() ![]() Methane is actually a gas at room temperature because of its low heat of vaporization. Water has a DH vap of 40.7 kJ/mol and Methane has a DH vap of 8.2 kJ/mol. Their molecular weights are very similar, but their Heats of Vaporization (how much heat per mole that has to be added to make them evaporate) are very different. What this means in practicle terms is that a liquid with strong intermolecular forces will have to be heated to a higher temperature before it will evaporate.įor example: Look at Methane (CH 4 M.W. ![]() The stronger the intermolecular forces that are holding a liquid together, the more energy that will be required to pull them apart. We just discussed some of them: intermolecular forces. As with anything in chemistry, or life for that matter, there are other factors that determine how easily a molecule can break free from the liquid. If a molecule is on the surface of the liquid, and has enough energy, it can break free and become a gas molecule. The most common way to add energy to a liquid system is by adding heat.Īs a liquid gains energy, the molecules begin to move around faster. Since we know that the particles of a gas are moving faster than those of a liquid, an input of energy must be required for a liquid to become a gas. Vaporization is the process of converting a liquid into a gas.
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