Which of the following property cannot be used to describe the state of a system?a)pressureb)volumec)temperatured)universal gas constantCorrect answer is option 'D'. Can you explain this answer?

Question

Answer

State functions are used to specify the state of a thermodynamic system. The state is described by measurable macroscopic particles like pressure, temperature, volume, amount, etc and the is P, V and T are called state variables.

Answer

Universal Gas Constant
Universal Gas Constant (R) is a proportionality constant that relates the energy of a sample of gas to the temperature and pressure of the gas. It is a constant value that is dependent on the particular gas being considered.

Properties used to describe the state of a system
- Pressure: Pressure is a measure of the force applied over a unit area. It is one of the properties that can be used to describe the state of a system. Pressure affects the behavior of gases, liquids, and solids.
- Volume: Volume is the amount of space occupied by a substance. It is another property that can be used to describe the state of a system. The volume of a substance is crucial in determining its physical properties.
- Temperature: Temperature is a measure of the average kinetic energy of the particles in a substance. It is a fundamental property used to describe the state of a system. Temperature influences the behavior and state of matter.

Explanation of why Universal Gas Constant cannot describe the state of a system
The universal gas constant (R) is not a property that can be used to describe the state of a system. Instead, it is a constant that relates the energy of a gas sample to its temperature and pressure. It is a proportionality constant in the ideal gas law equation (PV = nRT), where R is the universal gas constant. It does not directly describe the state or behavior of a system but rather helps in calculations involving gases. Therefore, the universal gas constant cannot be used as a descriptive property of the state of a system.

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Select incorrect statement(s)

Which of the following property is used as the dimensionless property?

The exact differential among the following for a perfect gas (where p, t and rare pressure, temperature and gas constant, respectively) is: [a] (P/RT)dT R.dP [b] RPdT RTdP [c] RP(dT/T) RT(dP/P) [d] RdT RT(dP/P) ?

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