Chemistry question

2kg of oxygen are introduced into a 10 dm3 capacity cylinder. the volume occupied by the gas is:
answer: 10dm3
how do we conclude the answer?

1 mole of any gas occupies 24dm^3 at rtp.

So, here we have a lot more than 1mol of oxygen (2000/32 = 62.5mol), but the container only has 10dm^3. Thus, O2 will occupy the 10dm^3 but at a reaally high pressure:)