When comparing the boiling points of two compounds,one is a gas and the other is a liquid,is there anything like the liquid will have a lower boiling point than the solid?

The molecular mass of the liquid is lower than the solid and they have the same type of intermolecular forces.

I don't understand the question. At what temperature is one a liquid and the other a gas? Is it the gas going to a solid or the liquid going to the solid.

At the same temperature one is a liquid and other is a liquid.

Being a liquid and having one more step to become vapour,is that a reason for the liquid to have a lower boiling point than the solid?

I think we have to assume that they are under the same pressure to compare their boiling points. I should've mentioned that!

I've made a very bad mistake.It should be corrected as one is a solid and the other is liquid.

I apologize for the inconveniences made!

Question: At the same temperature and under same pressure, one is a liquid and the other is a solid.The molecular mass of the liquid is lower than the solid and they have the same kind of intermolecular forces. Can we simply say the liquid has a lower boiling point than the solid,ignoring the given info(mass and intermolecular forces), because it has one more step for becoming vapour(a gas),while the solid have to go from solid to liquid and liquid to gas(two steps)?

I'm still confused, somewhat, but my gut feeling is you can not make any general statements about it. I think you can find some cases in which that is true and some in which it isn't true. At the moment, however, I can't come up with examples of either so I'm not all that comfortable with my answer.

How about I2 and Br2 for an example,at room temperature?

Br2 is a liquid at room temperature and it's molecular mass is lower than I2(s) and they have same kind of intermolecular forces too.

At the same temperature one is a liquid and other is a liquid.

Being a liquid and having one more step to become vapour,is that a reason for the liquid to have a lower boiling point than the solid?

Yes, it is possible for a liquid to have a lower boiling point than a solid, even if they have the same type of intermolecular forces. The boiling point of a substance is primarily determined by the strength of its intermolecular forces and the molecular mass. However, there are additional factors that can influence boiling points, such as molecular shape and polarity.

In the case you mentioned, where the liquid has a lower molecular mass than the solid but both have the same type of intermolecular forces, it is likely that the liquid will have a lower boiling point. This is because, generally, smaller molecules have weaker intermolecular forces due to their lower molecular mass. Weaker intermolecular forces require less energy to overcome, resulting in a lower boiling point.

To understand this concept, you can consider the factors that affect intermolecular forces and boiling points. For example, dipole-dipole forces, which occur between polar molecules, are stronger than London dispersion forces, which occur between non-polar molecules. Additionally, hydrogen bonding, a type of dipole-dipole force, is even stronger than regular dipole-dipole forces.

To compare the boiling points of two substances, you can examine their molecular masses and intermolecular forces. Generally, substances with larger molecular masses and stronger intermolecular forces will have higher boiling points. However, it is important to consider other factors such as molecular shape and polarity, as they can also influence boiling points.