The state of gas can be described by quoting the relationship between

Options

A. pressure, volume, temperature
B. temperature, amount, pressure
C. amount, volume, temperature
D. pressure, volume, temperature, amount

Explanation

To solve the question regarding the state of a gas and the relationships that describe it, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding State Functions**: The state of a gas can be described using state functions. These functions provide a way to describe the physical properties of the gas at a given state.

2. **Identifying Key Variables**: The primary state functions for a gas include:
- **Pressure (P)**: The force exerted by the gas per unit area.
- **Volume (V)**: The space occupied by the gas.
- **Temperature (T)**: A measure of the average kinetic energy of the gas particles.
- **Amount of Substance (n)**: The number of moles of the gas.

3. **Using the Ideal Gas Law**: The relationship between these state functions is encapsulated in the Ideal Gas Law, which is expressed as:
\[ PV = nRT \]
Here, \( R \) is the ideal gas constant, which does not change and is not a variable that describes the state of the gas.

4. **Conclusion**: From the Ideal Gas Law, we can conclude that the state of a gas is described by the variables: pressure (P), volume (V), temperature (T), and the amount of substance (n).

5. **Selecting the Correct Option**: Based on the relationships identified, the correct answer is option D, which includes pressure, volume, temperature, and amount.

### Final Answer:
The state of the gas can be described by quoting the relationship between pressure, volume, temperature, and amount (Option D).

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