Which of the following measurements describes the pressure of a gas?

• A. 760 mm Hg
• B. 0.50 mol
• C. 25 °C
• D. 2.0 L

Answer: (A)

Verified step by step guidance

1. Understand that pressure is a measure of the force that gas particles exert on the walls of their container per unit area.
2. Identify the units commonly used to describe pressure, such as atmospheres (atm), millimeters of mercury (mm Hg), pascals (Pa), or torr.
3. Examine each given measurement and determine what property it represents: 0.50 mol is amount of substance, 25 °C is temperature, 2.0 L is volume, and 760 mm Hg is a unit of pressure.
4. Recognize that 760 mm Hg is a standard pressure measurement (equivalent to 1 atm) and thus correctly describes the pressure of a gas.
5. Conclude that among the options, only 760 mm Hg represents the pressure of a gas.