The concentration of dissolved gases is expressed as Multiple choice question.molarity.percent.PSI.pressure.

Answering the Question

To determine how the concentration of dissolved gases is expressed, let's evaluate the provided options:

1. Molarity: This is a common way to express the concentration of a solution, specifically the number of moles of solute per liter of solution (mol/L). It is a relevant measure for solutions, including those of gases in liquids.

2. Percent: Concentration can also be expressed as a percentage, which indicates the amount of solute relative to the total solution volume or weight. This is another way to convey concentration but less specific than molarity in scientific contexts.

3. PSI (Pounds per Square Inch): This unit is used to measure pressure. It is not a measure of concentration.

4. Pressure: While pressure can affect the solubility and concentration of gases in liquids, it does not directly express concentration itself.

Conclusion

In this context, the most appropriate answer is molarity, as it directly measures the concentration of solutes in a solution. Therefore, the concentration of dissolved gases is expressed in terms of molarity.