What is the Volume of 0.5X Mass of Gas?

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In an airtight container with a capacity of V, removing half of the gas, leaving 0.5X mass, raises the question of the remaining gas's volume. Since the container is rigid and does not change size, the volume of the remaining gas remains V. The fundamental property of gas is its ability to expand to fill the available space. Therefore, even with 0.5X mass of gas left, it will occupy the entire volume of the container. The discussion emphasizes the behavior of gases in fixed-volume scenarios.
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A container has a capacity of V with X mass of gas in it.

I take away half of the gas leaving 0.5 X mass left.

What is the volume of the remaining gas?
 
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What do you think? (Is the container rigid? Does its size change when you remove some gas?)
 
it's an airtight container, and the size does not change when the gas is removed.
 
So what do you think happens to the remaining gas in the container? (What's the most distinguishing and basic property of a gas, compared to a liquid or solid?)
 
it expands?
 
Yes. A gas will expand to fill its container.
 
thx for your help
 

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