If the density of a gas at the sea level at `0^(@)C` is `1.29 kg m^(-3)`, what is its molar mass? (Assume that pressure is equal to `1"bar"`.)

Explanation

To find the molar mass of the gas given its density, we can use the ideal gas law and some modifications. Here’s a step-by-step solution:

### Step 1: Write down the ideal gas equation
The ideal gas equation is given by:
\[ PV = nRT \]
where:
- \( P \) = pressure
- \( V \) = volume
...