Which equation expresses the PV = nRT relationship for gases?

Study for the Chemistry for Engineers Test. Enhance your knowledge with multiple choice questions and in-depth explanations. Prepare confidently for your exam!

Multiple Choice

Which equation expresses the PV = nRT relationship for gases?

Explanation:
PV = nRT expresses how pressure, volume, temperature, and the amount of gas are connected for gases that behave ideally. The equation relies on the idea of an ideal gas, where molecules take up no volume and interact only through perfectly elastic collisions, so the macroscopic properties P, V, n, and T relate in a predictable way. P is the pressure, V the volume, n the number of moles, T the absolute temperature in kelvin, and R is the gas constant. The value of R depends on the units you use, for example 0.082057 L·atm·mol⁻¹·K⁻¹ when pressure is in atmospheres and volume in liters, or 8.314 J·mol⁻¹·K⁻¹ when pressure is in pascals and volume in cubic meters. This relationship is the fundamental tool for predicting how a gas will respond to changes in any one of the variables, such as how increasing temperature at constant n and P expands the volume. STP, or standard temperature and pressure, is just a reference set of conditions (1 atm, 273.15 K) used for comparisons, not the equation itself. The other options describe acid definitions, which are unrelated to gas behavior.

PV = nRT expresses how pressure, volume, temperature, and the amount of gas are connected for gases that behave ideally. The equation relies on the idea of an ideal gas, where molecules take up no volume and interact only through perfectly elastic collisions, so the macroscopic properties P, V, n, and T relate in a predictable way. P is the pressure, V the volume, n the number of moles, T the absolute temperature in kelvin, and R is the gas constant. The value of R depends on the units you use, for example 0.082057 L·atm·mol⁻¹·K⁻¹ when pressure is in atmospheres and volume in liters, or 8.314 J·mol⁻¹·K⁻¹ when pressure is in pascals and volume in cubic meters. This relationship is the fundamental tool for predicting how a gas will respond to changes in any one of the variables, such as how increasing temperature at constant n and P expands the volume. STP, or standard temperature and pressure, is just a reference set of conditions (1 atm, 273.15 K) used for comparisons, not the equation itself. The other options describe acid definitions, which are unrelated to gas behavior.

More Multiple Choice Questions
Subscribe

Get the latest from Passetra

You can unsubscribe at any time. Read our privacy policy