Why is fluorine a gas?

Fluorine gas and water vapor react to form hydrogen fluorine gas and oxygen what volume of hydrogen fluorine would be produced by this reaction if 3.7L of fluorine was consumed?

In fluorine, the electrons are tightly held to the nuclei. The electrons have little chance to wander to one side of the molecule, so the London dispersion forces are relatively weak. At a low enough temperature the molecules will all be solids. At a high enough temperature they will all be gases.