* Sublimation depends on pressure: Sublimation is the transition from solid to gas without going through the liquid phase. The pressure at which a substance sublimes is critical.
* Many substances sublime at specific conditions: While some substances are known to sublime at room temperature and atmospheric pressure (like dry ice, CO2), many others require specific conditions (low pressure, specific temperature).
To determine if a substance sublimes at 298K, you would need:
1. The substance's vapor pressure at 298K: A substance will sublime if its vapor pressure exceeds the surrounding pressure.
2. The surrounding pressure: The pressure at which the sublimation occurs is important.
Examples:
* Dry ice (CO2): Sublimes at room temperature (298K) and atmospheric pressure.
* Iodine: Sublimes at room temperature, but its vapor pressure is low. You need to heat it slightly to see significant sublimation.
* Naphthalene: Sublimes slowly at room temperature, but its vapor pressure is also low.
In short, you need to know the vapor pressure of the substance and the surrounding pressure to determine if it will sublime at 298K.
