A large flask fitted with a stop-cock is evacuated and weighted, its mass is found to be 134.567 g. It is then filled to a pressure of 735 mm at `31^(@)C` with a gas of unknown molecular mass and then reweighed, its mass is 137.456g. The flask is then filled with water and weighed again, its mass is now 1067.9g. Assuming that the gas is ideal, calculate the molar mass of the gas.

Explanation

To calculate the molar mass of the gas, we will follow these steps:

### Step 1: Calculate the mass of the gas
The mass of the gas can be calculated by subtracting the mass of the evacuated flask from the mass of the flask filled with gas.

\[ \text{Mass of gas} = \text{Mass of flask with gas} - \text{Mass of evacuated flask} \]
...