The density of a gas at `27^@C` and 760 mm pressure is 3.0 g/L. If the pressure remains constant, find out the temperature at which the density will be 2.4 g/L.

Explanation

To solve the problem, we will use the relationship between the density of a gas and its temperature, given that the pressure remains constant. The formula we will use is derived from the ideal gas law:

### Step-by-Step Solution:

1. **Understand the Relationship**:
The density (D) of a gas is related to its temperature (T) and pressure (P) by the formula:
\[
D = \frac{P \cdot M}{R \cdot T}
...