If partial pressure of gases is constant then which gas has max solubility in water He N2 H2 O2

To determine which gas has the maximum solubility in water when the partial pressure of the gases is constant, we can refer to Henry's Law. This law states that the amount of gas that dissolves in a liquid at a given temperature is directly proportional to the partial pressure of that gas above the liquid. However, when comparing different gases, we also need to consider their solubility coefficients in water.

Understanding Gas Solubility

Solubility in water varies significantly among different gases due to their molecular properties. The gases you mentioned—helium (He), nitrogen (N2), hydrogen (H2), and oxygen (O2)—each have distinct characteristics that influence their solubility.

Key Factors Affecting Solubility

• Molecular Size: Smaller molecules tend to have lower solubility.
• Polarity: Polar molecules are generally more soluble in water than nonpolar ones.
• Temperature: Higher temperatures typically decrease gas solubility.

Comparing the Gases

Now, let’s look at the specific gases:

• Helium (He): This noble gas is nonpolar and has low solubility in water. Its solubility coefficient is quite low.
• Nitrogen (N2): Also a nonpolar molecule, nitrogen has limited solubility in water, primarily due to its molecular structure.
• Hydrogen (H2): Hydrogen is a small, nonpolar molecule, and while it has some solubility, it is not very soluble in water.
• Oxygen (O2): Oxygen is more soluble in water compared to the other gases listed. It is slightly polar and has a higher solubility coefficient.

Conclusion on Solubility

Given these comparisons, oxygen (O2) has the highest solubility in water among the gases you mentioned. This is due to its molecular characteristics and the fact that it is essential for aquatic life, which relies on dissolved oxygen for respiration. In practical terms, this means that under constant partial pressure conditions, oxygen will dissolve more readily in water than helium, nitrogen, or hydrogen.

In summary, when considering gas solubility in water, oxygen stands out as the most soluble gas among the options provided, primarily due to its unique properties and interactions with water molecules.