The mass of the flask filled with the gas is \(143.289 \, \text{g}\). The mass of the evacuated flask is \(143.187 \, \text{g}\).
The mass of the gas is:
\[
\text{Mass of gas} = 143.289 \, \text{g} - 143.187 \, \text{g} = 0.102 \, \text{g}
\]
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