If you had a five liter balloon of argon gas and a five liter balloon of xenon gas,and you removed 10 grams of gas from each balloon,the balloons would both shrink down to the same size.

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Quizplus · Accepted Answer

The amount by which each balloon shrinks depends on the molar mass of the gas and the amount (in moles) removed, not just the weight. Argon and xenon have different molar masses, so removing the same mass of each gas would remove different amounts of moles, leading to different final volumes.

If You Had a Five Liter Balloon of Argon Gas