* Carbon dioxide (CO₂)
* Nitrogen dioxide (NO₂)
* Sulfur dioxide (SO₂)
Why these oxides are gases:
* Low molecular weight: These oxides have relatively low molecular weights. This means their molecules are light and can move freely, leading to a gaseous state.
* Weak intermolecular forces: The intermolecular forces between the molecules of these oxides are weak (van der Waals forces). These weak forces allow the molecules to easily escape from the liquid state and become gases.
* High vapor pressure: These oxides have high vapor pressures at room temperature, meaning they readily evaporate into the gaseous phase.
Note: Other oxides may also exist as gases at higher temperatures or lower pressures, but these are the most common ones found as gases at standard conditions.
