An evacuated glass vessel weights 50.0 g when empty, 148.0 g when filled with a liquid of density 0.98 g `mol^(-1)` and 50.5 g when filled with an ideal gas at 760 mm Hg at 300 K. Determine the molecular weight of the gas.

Explanation

To determine the molecular weight of the gas in the evacuated glass vessel, we can follow these steps:

### Step 1: Determine the mass of the liquid
The mass of the liquid can be calculated by subtracting the mass of the empty vessel from the mass of the vessel filled with the liquid.

\[ \text{Mass of liquid} = \text{Mass of vessel with liquid} - \text{Mass of empty vessel} \]
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