Question: When a large evacuated flask is filled with argon gas, its mass increases by 3.224 g when the same flask is again evacuated and then

When a large evacuated flask is filled with argon gas, its mass increases by 3.224 g when the same flask is again evacuated and then filled with a gas of unknown molar mass, the mass increase is 8.102 g.
(a) Based on the molar mass of argon, estimate the molar mass of the unknown gas.
(b) What assumptions did you make in arriving at your answer?

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